Etymology
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pretty (n.)

"a pretty person or thing," 1736 of things, by 1773 of persons, from pretty (adj.). Prettinesses "pretty things, etc." is attested from 1640s.

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flexibility (n.)
1610s, of physical things, from French flexibilité (in Old French, "weakness, vacillation") or directly from Late Latin flexibilitatem (nominative flexibilitas), from Latin flexibilis "pliant, yielding" (see flexible). Of immaterial things from 1783.
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skyhook (n.)
also sky-hook, "imaginary device to hold things up," 1915, originally aviators' jargon, from sky (n.) + hook (n.). Applied from 1935 to actual device for lifting things into the air.
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assortment (n.)
1610s, "action of arranging into kinds or classes," from assort + -ment. Sense of "group of things of the same sort" is attested from 1759; that of "group of arranged things whether of the same sort or not" from 1791.
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quiddity (n.)

"a trifling nicety in argument, a quibble," 1530s, from Medieval Latin quidditas "the essence of things," in Scholastic philosophy, "that which distinguishes a thing from other things," literally "whatness," from Latin quid "what," neuter of indefinite pronoun quis "somebody, someone or other" (from PIE root *kwo-, stem of relative and interrogative pronouns).

The sense developed from scholastic disputes over the nature of things. Original classical meaning "real essence or nature of a thing, that which distinguishes a thing from other things and makes it what it is" is attested in English from late 14c. (quidite).

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ceteris paribus 
Modern Latin, "other things being equal."
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agathism (n.)
the doctrine that all things tend toward the good, 1830, from agathist + -ism.
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collectibles (n.)
also collectables, "things worth collecting," 1952, American English, from collectible.
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uncollected (adj.)
1730, of things, from un- (1) "not" + past participle of collect (v.).
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stray (adj.)
c. 1600, of animals; 19c. of persons and things, from stray (n.) and in part a shortening of astray.
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