Etymology
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lusory (adj.)
"playful," 1650s, from Latin lusorius "belonging to a player," from lusor "player," from stem of ludere "to play" (see ludicrous). Related: Lusorious (1610s).
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ludic (adj.)
"spontaneously playful," 1940, a term in psychiatry, from French ludique, from Latin ludere "to play" (see ludicrous).
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illusory (adj.)
1590s, from French illusorie, from Late Latin illusorius "ironical, of a mocking character," from illus-, past participle stem of Latin illudere "mock, jeer at, make fun of," literally "play with," from assimilated form of in- "at, upon" (from PIE root *en "in") + ludere "to play" (see ludicrous).
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illude (v.)
early 15c., "to trick, deceive; treat with scorn or mockery," from Latin illudere "to make sport of, scoff at, mock, jeer at," from assimilated form of in- "in, into" (from PIE root *en "in") + ludere "to play" (see ludicrous).
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lusus naturae (n.)
in natural history, "freak of nature," 1660s, a Latin phrase, from lusus "a play," from stem of ludere "to play" (see ludicrous) + genitive of natura (see nature (n.)). Originally of fossils, before there was a scientific basis for understanding their existence.
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collusion (n.)

"secret agreement for fraudulent or harmful purposes," late 14c., from Old French collusion and directly from Latin collusionem (nominative collusio) "act of colluding," from colludere, from assimilated form of com "with, together" (see com-) + ludere "to play" (see ludicrous). "The notion of fraud or underhandedness is essential to collusion" [Fowler].

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allude (v.)

1530s, "to mock" (transitive, now obsolete), from French alluder or directly from Latin alludere "to play, make fun of, joke, jest," also of waves lapping the shore, from assimilated form of ad "to" (see ad-) + ludere "to play" (see ludicrous). The meaning "make an indirect reference, point in passing" is from 1530s. Related: Alluded; alluding.

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elude (v.)
1530s, "delude, make a fool of," from Latin eludere "finish play, win at play; escape from or parry (a blow), make a fool of, mock, frustrate; win from at play," from assimilated form of ex "out, away" (see ex-) + ludere "to play" (see ludicrous). Sense of "evade" is first recorded 1610s in a figurative sense, 1630s in a literal one. Related: Eluded; eludes; eluding.
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prelude (n.)

"introductory performance; a preliminary to an action event or work," 1560s, from French prélude "notes sung or played to test the voice or instrument" (1530s), from Medieval Latin preludium "prelude, preliminary," from Latin praeludere "to play beforehand for practice, preface," from prae- "before" (see pre-) + ludere "to play" (see ludicrous). Purely musical sense of "movement or piece forming the introduction to a musical work" is attested in English by 1650s. Related: Preludial; prelusive; prelusory; preludious; prelusion.

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allusion (n.)

1540s, "metaphor, parable" (a sense now obsolete); 1550s, "word-play, joke;" 1610s as "passing or casual reference," from Latin allusionem (nominative allusio) "a playing with, a reference to," noun of action from past-participle stem of alludere "to play, jest, make fun of," from ad "to" (see ad-) + ludere "to play" (see ludicrous). An allusion is never an outright or explicit mention of the person or thing the speaker seems to have in mind.

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