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LessonAsset TitleTier Word/PhrasePart of SpeechWord Forms - Plural/TensesDefinitionsSynonymsUse in a SentenceAntonyms
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1.0"What Happened on Easter Island?"2statuenounstatuesa carved or cast figure of a person or animal, especially one that is life-size or largerbust, sculptureIn China, archaeologists uncovered more than 7000 life sized statues of warriors made out of terracotta.
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1.0"What Happened on Easter Island?"2scholarnounscholars, scholarlya learned person, esp. one who is engaged in research or studyacademic, intellectualProfessor Samuels is a distinguished scholar of medeival European history.
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1.0"What Happened on Easter Island?"3moainounany of the gigantic carved stone figures found on Easter IslandThere are about 900 moai across Easter Island.
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1.0"What Happened on Easter Island?"3deforestationnoundeforestthe removal of forest or trees from an area of landlogging, clear-cuttingProducing paper encourages deforestation and other negative environmental impacts.conservation
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1.0"What Happened on Easter Island?"3rongorongonounsystem of writing developed by the people of Easter IslandRongorongo has yet to be deciphered by scholars, leaving the meaning behind the system of glyphs a mystery.
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1.0"What Happened on Easter Island?"3brackishadjectivebrackishnesssomewhat saltybrinyAfter hiking for many hours without any water, we were disappointed to learn that the lake we had stumbled upon was brackish.
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1.0"What Happened on Easter Island?"3botanistnounan expert in the scientific study of plantsI once took a class in which a botanist taught us about all the different kinds of edible plants that exist in this area.
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1.0"What Happened on Easter Island?"3charcoalnouncharcoals, charcoaling, charcoaleda black solid that results from the heating of wood, bone, or other forms of organic matterashes, sootAfter the fire, all that was left of the once lush, green forest was mounds of charcoal.
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1.0"What Happened on Easter Island?"3epidemicnounempidemicsan outbreak, usu. of disease, that spreads rapidly, afflicting many individualsoutbreak, plagueThe Ebola epidemic has caused both major loss of life and significant socioeconomic disruption in West Africa.
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1.0What Is Big History?2starnounstarsany of a vast number of celestial bodies other than the moon visible from earth as points of light in the night skysunMy neighbor has a telescope on his roof that he uses to look up at the stars on clear, dark nights.
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1.0What Is Big History?2universenoununiversesall matter and space in existence, including the earth and the heavenscosmosThe Milky Way is just one of numerous galaxies scattered about the Universe.
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1.0What Is Big History?2originnounorigins, originatethe point or place where something begins, arises, or is derivedbeginning, genesis, root, dawn, startThe origin of humanity can be traced back hundreds of thousands of years. end
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1.0What Is Big History?2timelinenountimelinesa graphic presentation of a chronology of events and their dates, listed from left to right along a horizontal line or in a vertical columnchronologyThe timeline covered the entirety of the Han Dynasty.
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1.0What Is Big History?2complexitynouncomplexities, complexthe quality of being intricate and compoundedcomplicated, intricateAs you progress through grade school, high school, and eventually college, the subjects you learn about will increase in complexity. simplicity
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1.0What Is Big History?3thresholdnounthresholdsmoments in the history of the Universe when specific ingredients under the right "Goldilocks Conditions" come together to create something new and more complexturning pointThis threshold marked the beginning of complex life in the form of multicellular organisms.
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1.0Crash Course: The Big Bang2historynounhistories, historicalthe continuum of events occurring in succession leading from the past to the present and even into the futureaccount, log, chronicleEvents that happen now or years from now will become part of history.
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1.0Crash Course: The Big Bang2scalenounscalesdegrees of magnification, or perspective, used to measure time, space, and sizeextent, scopeCosmology is the study of the Universe on its largest scales, including its origin.
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1.0Crash Course: The Big Bang2universenoununiversesall matter and space in existence, including the earth and the heavenscosmosThe Milky Way is just one of numerous galaxies scattered about the Universe.
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1.0Crash Course: The Big Bang3Big Bangnouna theory, first articulated in the 1920s, proposing that the Universe started out extremely hot and dense and gradually cooled off as it expandedThe theory of the Big Bang is widely accepted among most of the scientific community.
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1.0Crash Course: The Big Bang3matternounthe physical material of the Universe, including subatomic particles, atoms, and the substances that are built out of themstuff, substanceMatter makes up everything you know and will ever know.
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1.0Crash Course: The Big Bang3radiationnounradiational, radiatethe emission of particles or waves of energy, as by radioactive material or by electrical circuits or devicesMany are concerned about toxic radiation from nuclear waste.
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1.0Crash Course: The Big Bang3cosmic inflationnounthe idea that space and time (space-time) underwent an expansion at a rate much faster than the speed of light during the first 10-36 seconds after the Big BangexpansionIf inflation continued past the first moments of the Universe, our Universe would be much larger than it is today.shrinkage
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1.0Crash Course: The Big Bang3cosmic background radiation (CBR)nounradiation coming from every direction in the Universe that is considered to be the remnant of the Big BangCosmic background radiation can be picked up by some of the most basic devices, like radio players.
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1.0A Big History of Everything – H23gravitynoungravitiesthe force by which a planet or other such body tends to draw objects toward its centerpull, attractionAs if he were defying gravity, the magician seemed to be levitating in the air.
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1.0A Big History of Everything – H23orbitnounorbits, orbiting, orbitedthe curved path in which a planet, satellite, or spacecraft revolves about another body; to revolve about (another body) in a curved pathcircuit, revolution; circle, revolve, rotateEarth's orbit around the sun is oval shaped.
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1.0A Big History of Everything – H23atmospherenounatmosphericthe mixture of gases surrounding a planetair, skyThe composition of the Earth’s atmosphere has played a critical role in the development of life on Earth.
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1.0A Big History of Everything – H23corenounthe dense center of the Earth, made mostly of iron, and some nickelcenterThe movement of molten iron and nickel in the outer core generates Earth's magnetic field.
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1.0A Big History of Everything – H23magnetic fieldnounmagnetic fieldsa region of space in which a magnetic force occurs, especially as a result of electrical current or the motions of charged particles such as electronsmagnetism, magnetic shieldScientists think that sunspots are caused by strong magnetic fields below the surface of the sun.
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1.0A Big History of Everything – H23asteroidnounasteroidssmall rocky, icy, and metallic celestial bodies left over from the formation of the Solar System which can range from a few meters to several hundred kilometers in widthplanetoidMost asteroids in our solar system are located in what is called the asteroid belt.
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1.0A Big History of Everything – H23threshold momentnounthreshold momentsmoments in the history of the Universe when specific ingredients under the right "Goldilocks Conditions" come together to create something new and more complexturning pointThis threshold moment marks the beginning of complex life in the form of multicellular organisms.
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1.1To Scale: The Solar System2scalenounscalesdegrees of magnification, or perspective, used to measure time, space, and sizeextent, scopeCosmology is the study of the Universe on its largest scales, including its origin.
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1.1To Scale: The Solar System2modelnounmodelsa representation or copy, often smaller than the original and used as a guide to making a thing in full sizereplicaMy dad and I enjoy building model airplanes in our free time.
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1.1To Scale: The Solar System3orbitnounorbits, orbiting, orbitedthe curved path in which a planet, satellite, or spacecraft revolves about another body; to revolve about (another body) in a curved pathcircuit, revolution; circle, revolve, rotateEarth's orbit around the sun is oval shaped.
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1.1To Scale: The Solar System3planetnounplanetsany celestial body (other than comets or satellites) that revolves around a starglobeThe planet Mars was named after the Roman god of war.
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1.1To Scale: The Solar System3solar systemnounsolar systemsthe Sun and the objects that orbit it; the area in space in which the Sun’s gravitational pull is the dominant forceplanetary systemNewton's great contribution to the science of mechanics was the discovery that the same laws of nature are valid throughout our solar system.
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1.1To Scale: The Solar System3microscopicadjectivemicroscopicallytoo small to be seen with the naked eyetiny, minuteBelieve it or not, we have microscopic bugs that live in our eyebrows and eyelashes!macroscopic
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1.1"Big History Overview"2speciesnounin biology, the most fundamental classification of living things, comprising individuals that can breed with one another but not with those of other speciesbreed, categoryThe human species is the most advanced of all living organisms on this Earth.
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1.1"Big History Overview"2universenoununiversesall matter and space in existence, including the earth and the heavenscosmosThe Milky Way is just one of numerous galaxies scattered about the Universe.
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1.1"Big History Overview"2starnounstarsany of a vast number of celestial bodies other than the moon visible from earth as points of light in the night skysunMy neighbor has a telescope on his roof that he uses to look up at the stars on clear, dark nights.
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1.1"Big History Overview"2complexitynouncomplexities, complexthe quality of being intricate and compoundedcomplicated, intricateOrganic compounds are not only unique in their complexity, they are also unusually numerous.simplicity
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1.1"Big History Overview"3origin storynounorigin storiesa narrative that explains how something came to bemythologyEvery religion has its own origin story that explains the creation of the Universe.
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1.1"Big History Overview"3thresholdnounthresholdsmoments in the history of the Universe when specific ingredients under the right "Goldilocks Conditions" come together to create something new and more complexturning pointThis threshold marked the beginning of complex life in the form of multicellular organisms.
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1.2Big Questions – H22fundamentaladjectivefundamentallyof or relating to essential purpose or functionvital, essential, keyGravity is the fundamental force of attraction between any two objects that have mass.extraneous, minor
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1.2Big Questions – H22originateverboriginates, originated, originatingto arise or come into beingstart, begin, emergeMost of the English language originates from Greek or Latin roots. cease, end
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1.2Big Questions – H23turning pointnounturning pointsa moment when a decisive change occursclimax, critical point, thresholdThe discovery that stars move was an important turning point in the study of our solar system.
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1.2Big Questions – H23cosmosnounthe totality of material existence; the universe beyond the earthgalaxy, world, universeIt is natural for humans to ponder the reason for their existence in the vast cosmos.
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1.2Big Questions – H23NeanderthalnounNeanderthalsan extinct species of human that existed in ice-age Europe, often characterized by a receeding forehead and prominent brow ridgeWe often think of Neanderthals as cave men that lived with the dinosaurs, but in fact, Neanderthals lived at the same time as some early moden humans!
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1.2"Origin Stories Introduction"2symbolnounsymbols, symbolicsomething that represents something else, especially a material sign or object that stands for a complex or abstract conceptemblem, tokenThe rose is a symbol of love.
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1.2"Origin Stories Introduction"2culturenouncultures, culturalall the knowledge and values shared by a societycivilization, way of life, lifestyle, folkloreThe drive-in movie was once a staple of American culture.
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1.2"Origin Stories Introduction"3oral traditionnounoral traditionsthe stories, beliefs, etc., that a group of people share by telling stories and talking to each otheroral historyTales of my great-great-great grandfather's adventures as a sea captain have been passed down through my family by oral tradition.written history
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1.2"Origin Stories Introduction"3origin storynounorigin storiesa narrative that explains how something came to bemythologyBig History teaches us the origin story of the entire Universe.
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1.2"Origin Stories Introduction"3literateadjectiveable to read and writeeducated, intellectual, learnedShe hadn't been able to attend school and had not become literate.illiterate
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1.2"Origin Stories Introduction"3ethnologistnounethnologists, ethnologya person who studies different societies and culturesThe age-old customs of the locals have long fascinated ethnologists.
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1.2"Origin Story: Modern Scientific"2starnounstarsany of a vast number of celestial bodies other than the moon visible from earth as points of light in the night skysunMy neighbor has a telescope on his roof that he uses to look up at the stars on clear, dark nights.
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1.2"Origin Story: Modern Scientific"2climatenounclimates, climaticthe weather conditions most prevailing in a place, averaged over several years or decadesweather patternsAntarctica is known for both its cold climate and its penguins.
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1.2"Origin Story: Modern Scientific"3atomnounatoms, atomica small unit of matter composed of protons, electrons, and usually neutronsparticleEverything is made of atoms, including you and me.
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1.2"Origin Story: Modern Scientific"3elementnounelementsa substance that that cannot be broken down into simpler substances by ordinary chemical processes. Each element is distinguished by its atomic number, or, the number of protons in its nucleiSome of the more well-known elements are lead, zinc, hydrogen, and gold.
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1.2"Origin Story: Modern Scientific"3ozone layernounlayer of the atmosphere characterized by a high ozone content that blocks ultraviolet radiation from reaching the EarthGlobal warming and climate change have caused holes to appear in Earth's ozone layer, damaging its integrity and exposing us all to harmful UV radiaiton.
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1.2"Origin Story: Modern Scientific"3atmospherenounatmosphericthe mixture of gases surrounding a planetair, skyThe composition of the Earth’s atmosphere has played a critical role in the development of life on Earth.
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1.2"Origin Story: Modern Scientific"3matternounthe physical material of the Universe, including subatomic particles, atoms, and the substances that are built out of themstuff, substanceMatter makes up everything you know and will ever know.
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1.2"Origin Story: Modern Scientific"3fossil fuelnounfossil fuelsa carbon-based material such as coal, oil, or natural gas that can be used as an energy sourcenonrenewable fuel sourceFossil fuels were originally formed when the remains of living organisms were buried and broken down by intense heat and pressure over millions of years.renewable fuel source
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1.2"Origin Story: Chinese"2chaosnounchaotica state, condition, or place of complete disorder and confusionanarchy, confusionHe lived a monastic life, reflecting on his place in the world and secluding himself from the chaos outside his home.order
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1.2"Origin Story: Chinese"3marrownounmarrows, marrowish, marrowythe soft fatty tissue that fills most bone cavitiestissue, meatBone marrow transplants can be used to treat certain types of cancer such as leukemia.
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1.2"Origin Story: Chinese"3pillarnounpillarsa tall, often cylindrical shaft used to support a structure or to serve as a decoration or monumentcolumnThe earthquake caused cracks to appear in the pillars holding up the temple, causing many people to question its structural integrity.
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1.2"Origin Story: Chinese"3fertileadjectivefertiley, fertilenessproducing or caoable of producing abundant growth of farm crops or other vegetationfruitful, lush, abundantThe crops flourished in the fertile soil.barren, infertile
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1.2"Origin Story: Chinese"3yin and yangnounthe idea that all things exist as inseparable and contradictory opposites, including female-male, aggressive-passive, cold-hot, dark-light, and wet-dryIn Chinese origin stories, the world began as a huge egg containing chaos, a mixture of yin and yang.
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1.2"Origin Story: Judeo-Christian"2governverbgoverns, governing, governedto rule over or in by political or sovereign authoritydominate, lead, ruleThe country is governed by the parliament.abandon, neglect
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1.2"Origin Story: Judeo-Christian"2creationnounthe act of starting something for the first time; introducing something newconception, foundation, originationBoth Jews and Christians see the universe as God's creation.destruction
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1.2"Origin Story: Judeo-Christian"2blessverbblesses, blessing, blessedto make holy by religious ritualsanctify, consecrate, hallowThe priest blessed the marriage.desecrate
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1.2"Origin Story: Judeo-Christian"3vegetationnounplants or plant life generally, as in a particular areagreenery, plantsThe vegetation by the river hid the elk from view.
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1.2"Origin Story: Judeo-Christian"3genesisnounthe first book of the Old Testament, which tells of the creation of the universe and the history of the Hebrew patriarchsorigin, provenanceIn the story of genesis, God creates humans last of all creation.
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1.2"Origin Story: Judeo-Christian"3livestocknoundomestic animals, such as cows, horses, or sheep, raised or kept on a farm or ranchanimalsCommon examples of livestock include pigs and cows.
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1.2"Origin Story: Judeo-Christian"3domenoundomes, doming, domeda rounded, circular roof or ceiling on a room or building; something that has a shape similar to an architectural dome, such as a rounded rock formation or the skyThe dome-like shape of the sky is evidence to the fact that the Earth is round.
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1.2"Origin Story: Iroquois"2volunteerveruvolunteers, volunteering, volunteeredto present oneself for work or service; to offer (one's time or labor) freely or for no payenlist, sign-upI think I'll volunteer at the soup kitchen this year.compel, obligate, force
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1.2"Origin Story: Iroquois"2fatenounfates, fatedultimate resultoutcome, fortuneI was disappointed with the book's ending because I wanted to know the fate of the other characters.
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1.2"Origin Story: Iroquois"2islandnounislandsa body of land smaller than a continent and completely surrounded by waterisle, archipelagoOnce on the islands, the ancestral species could evolve rapidly.mainland
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1.2"Origin Story: Iroquois"2rootnounroots, rootedthe part of a plant that usu. grows underground, absorbs water and nutrients, and attaches the plant to the soilfoundation, baseShe pulled the weeds along with their roots.
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1.2"Origin Story: Iroquois"3councilnouncouncilsan assembly of persons gathered together for administrative, legislative, or advisory purposesassemble, board, committeeThe town council will be voting on the issue tonight.
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1.2"Origin Story: Iroquois"3chiefnounchiefsthe foremost or most important person in a group; leaderleader, headThe chief of police was in charge of the investigation.
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1.2"Origin Story: Mayan"2memorynounmemoriesan experience, person, or thing that one remembersrecollection, reminiscenceTheir memories came back slowly after the accident. fiction
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1.2"Origin Story: Mayan"2dawnnoundawnsthe first appearance or beginning of something long-lastingbeginning, start, emergenceThe dawn of a new world was upon them.end, finale
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1.2"Origin Story: Mayan"3makernounmakerssomeone or something that makes or creates thingsconstructor, creatorMy grandmother was a wonderful maker of pies.destructor
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1.2"Origin Story: Mayan"3nurtureverbnurtures, nurturing, nurturedto care for and encourage the growth and development of (a living thing)cultivate, foster, nourishShe carefully nurtured her tiny plants.neglect
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1.2"Origin Story: Mayan"3divinernoundivinersone who is spiritual or godlike, as opposed to the earthly or worldly mystic, oracleI was given the opportunity to ask the mystical diviner about my future.
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1.2"Origin Story: Greek"3divineajectiveof, from, pertaining to, or characteristic of a god or godsgodlike, omnipotentThey prayed to the goddess for divine wisdom.earthly, ordinary
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1.2"Origin Story: Greek"3fertilizeverbfetilizes, fertilizablecause (an egg, female animal, or plant) to develop a new individual by introducing male reproductive materialimpregnate, inseminateThe male fish fertilizes the eggs of the female.lay bare
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1.2"Origin Story: Greek"3castrateverbcastrates, castrating, castratedto remove the sexual organs of, esp. the testiclesneuter, sterilize The vet suggested that the farmer castrate his male bulls.
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1.2"Origin Story: Greek"3courtnouncourtsa sovereign and his or her councilors, together making up a ruling powercouncilThe king called on his court to give him advice regarding the ongoing war.
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1.2"Origin Story: Greek"3consortnounconsortsa wife or husband, esp. of a royal personagespouse, partnerPrince Philip is the consort of Queen Elizabeth II.
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1.2"Origin Story: Greek"3prophecynounpropheciesa prediction or admonition, especially when uttered by one considered to be a divine agent or prophetdivination, predictionThe prophecy states that the new king will be born on the 21st of October.
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1.2"Origin Story: Greek"3imprisonmentnounimprisonmentsthe state of being kept in a prison or other place of confinementconfinement, detention, prisonThe disproportionate imprisonment of Black men for minor drug offences has devastated the Black community in the United States.liberation, discharge, freedom
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1.2"Origin Story: Zulu"2reednounreedsany of various tall marsh grasses or their straight, jointed, hollow stalkstwigThe reed swayed in the wind, creating a majestic picture of the landscape.
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1.2"Origin Story: Zulu"2ancestornounancestorssomeone from whom you are descended (but usually more remote than a grandparent)forefatherImagine the surpise of that early ancestor of ours who stuck a willow branch into the ground, only to find that it grew into a tree.descendant
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1.2"Origin Story: Zulu"2sproutverbsprouts, sprouted, sproutingto start to grow, as a shoot or budrise, emergeThe bud began to sprout once the spring sun came out.die, shrivel
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1.2"Origin Story: Zulu"2harvestverbharvests, harvested, harvestingthe gathering of ripe cropscollect, gather, pickTo harvest crops this early in the season would be useless as they still have a long way to grow. abandon, leave
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1.2"Origin Story: Zulu"3mortaladjectivemortalitysubject to death; destined to dieperishableAll mortal beings of the world only have so long to live.deathless, immortal, undying
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1.2"Origin Story: Zulu"3fertileadjectivefertiley, fertilenessproducing or caoable of producing abundant growth of farm crops or other vegetationfruitful, lush, abundantThe crops flourished in the fertile soil.barren, infertile
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1.2"Origin Story: Efik"2worshipverbworships, worshipped, worshippingto render religious devotion, honor, and love toadore, revere, venerateThe ancient Greeks worshiped their gods in temples such as these.abhor, condemn
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1.2"Origin Story: Efik"2farmverbfarms, farming, farmedto cultivate (land) or raise (animals)cultivate, grow, harvestThey had to drain the swamp before they could farm the land.buy