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circadian (adjective)
Def: noting or pertaining to rhythmic biological cycles recurring at approximately 24-hour intervals.

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nugatory (adjective)
Def: of no force or effect; ineffective; futile; vain.

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cenotaph (noun)
Def: a sepulchral monument erected in memory of a deceased person whose body is buried elsewhere.

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tesseract (noun)
Def: the generalization of a cube to four dimensions.

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persnickety (adjective)
Def: overparticular; fussy.

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asterism (noun)
Def: a group of stars.

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hominid (noun)
Def: any member of the family Hominidae, consisting of all modern and extinct humans and great apes, and all their immediate ancestors.

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repast (noun)
Def: a meal.

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spendthrift (noun)
Def: a person who spends possessions or money extravagantly or wastefully; prodigal.

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ankh (noun)
Def: a tau (T-shaped) cross with a loop at the top, used as a symbol of generation or enduring life.

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unguinous (adjective)
Def: resembling, containing, or consisting of fat or oil; greasy; oily.

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nebbish (noun)
Def: a pitifully ineffectual, luckless, and timid person.

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epilogue (noun)
Def: a concluding part added to a literary work, as a novel.

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anorak (noun)
Def: a hooded pullover jacket originally made of fur and worn in the Arctic, now made of any weather-resistant fabric.

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prerogative (noun)
Def: a right, privilege, etc., limited to a specific person or to persons of a particular category.

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stewardship (noun)
Def: the responsible overseeing and protection of something considered worth caring for and preserving.

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ransack (verb (used with object))
Def: to search through for plunder; pillage.

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imp (noun)
Def: a little devil or demon; an evil spirit.

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cockade (noun)
Def: a rosette, knot of ribbon, etc., usually worn on the hat as part of a uniform, as a badge of office, or the like.

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allyship (noun)
Def: the status or role of a person who advocates and actively works for the inclusion of a marginalized or politicized group in all areas of society, not as a member of that group but in solidarity with its struggle and point of view and under its leadership.

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fomites (plural noun)
Def: surfaces, as clothing or door handles, that can become contaminated with pathogens when touched by the carrier of an infection, and can then transmit the pathogens to those who next touch the surfaces.