Etymology
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roleplay (n.)

also role-play, "act or condition of behaving as another would behave in a certain situation," 1958, from the verbal phrase, "to act out the role of" (by 1949); see role (n.) + play (v.). Related: Role-playing

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cosplay (n.)

"practice or hobby of dressing as a character from a movie, book, or video game, especially one from Japanese manga and anime," 1993, according to Merriam-Webster, from costume (n.) + play (n.), based on a Japanese word formed from the same English elements and alleged to date from 1983. Also used as a verb.

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replay (v.)

by 1862, in sporting jargon (curling), "to play (a match) again," from re- "again" + play (v.). Of sound recordings (later video, etc.), "reproduce what has been recorded," by 1912. Related: Replayed; replaying.

The noun is from 1895 as "a replayed match" in sports. The meaning "action of replaying" a sound recording, film, later also video, etc., is by 1953.

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player (n.)

Middle English pleiere, from Old English plegere "one who takes part in pastimes or amusements," agent noun from play (v.). Stage sense of "performer of plays, actor," also "one who performs on a musical instrument" are from c. 1400. Meaning "contestant in field or martial games" is from early 15c.; of table games, late 14c. As a pimp's word for himself (also playa), attested from 1974 (sexual senses of play (v.) go back to 13c.). Player-piano is attested from 1901.

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overplay (v.)

"to emphasize (something) too much," 1933, a metaphor from card games, in to overplay (one's) hand, "to spoil one's hand by bidding in excess of its value" (1926), from over- + play (v.). Earlier (from 1819) in a theatrical sense, "act (a part) with an extravagant and unnatural manner." Middle English had overpleien in the sense of "to outplay, defeat." Related: Overplayed; overplaying.

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foreplay (n.)

by 1921 in sexual sense, from fore- + play (n.); Freud's Vorlust was translated earlier as fore-pleasure (Brill, 1910). A more direct translation from the German would be thwarted by the sense drift in English lust (n.). Earlier as a theatrical term:

In fact the poem which Mr. Brooks has translated is but the "prologue to the swelling theme," the fore-play to the actual drama of Faust. [The Christian Examiner and Religious Miscellany, Jan.-May 1857]
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lark (n.2)
"spree, frolic, merry adventure," 1811, slang, of uncertain origin. Possibly a shortening of skylark (1809), sailors' slang for "play rough in the rigging of a ship" (larks were proverbial for high-flying). Or perhaps it is an alteration of English dialectal or colloquial lake/laik "to play, frolic, make sport" (c. 1300, from Old Norse leika "to play," from PIE *leig- (3) "to leap") with unetymological -r- common in southern British dialect. The verb lake, considered characteristic of Northern English vocabulary, is the opposite of work but lacks the other meanings of play. As a verb, from 1813. Related: Larked; larking.
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*dlegh- 
Proto-Indo-European root found in Celtic, Germanic, Slavic, and possibly Latin, meaning "to engage oneself, be or become fixed."

It forms all or part of: indulge; indulgence; play; pledge; plight (v.) "to pledge;" replevin.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit drmha-, drhya- "to fix, make firm;" Old Avestan derez- "fetter;" Gaulish delgu "to hold," Middle Welsh dala "to hold," Old Breton delgim "to hold;" Old Saxon plegan "vouch for," Gothic tulgjan "to fasten."
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jeu d'esprit (n.)
"a witticism," 1712, from French, from jeu "play, game," from Latin jocum "jest, joke, play, sport" (see joke (n.)).
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spiel (n.)
"glib speech, pitch," 1896, probably from verb (1894) meaning "to speak in a glib manner," earlier "to play circus music" (1870, in a German-American context), from German spielen "to play," from Old High German spilon (cognate with Old English spilian "to play"). The noun also perhaps from German Spiel "play, game."
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