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aleatory

[ey-lee-uh-tawr-ee, -tohr-ee, al-ee-] /ˈeɪ li əˌtɔr i, -ˌtoʊr i, ˈæl i-/
adjective
1.
Law. depending on a contingent event:
an aleatory contract.
2.
of or pertaining to accidental causes; of luck or chance; unpredictable:
an aleatory element.
3.
Music. employing the element of chance in the choice of tones, rests, durations, rhythms, dynamics, etc.
Also, aleatoric
[ey-lee-uh-tawr-ik, -tor-, al-ee-] /ˌeɪ li əˈtɔr ɪk, -ˈtɒr-, ˌæl i-/ (Show IPA)
.
Origin
1685-1695
1685-95; < Latin āleātōrius, equivalent to āleātōr- (stem of āleātor gambler (āle(a) game of chance + -ātor -ator) + -ius adj. suffix; see -tory1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for aleatoric

aleatory

/ˈeɪlɪətərɪ; -trɪ/
adjective
1.
dependent on chance
2.
(esp of a musical composition) involving elements chosen at random by the performer
Word Origin
C17: from Latin āleātōrius, from āleātor gambler, from ālea game of chance, dice, of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for aleatoric
adjective

done randomly; characterized by chance, often in reference to art or music

Examples

Aleatoric music incorporates elements of chance in its structure.

Word Origin

from 'aleatory' which derives from 'alea', a die, the dice

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Word Origin and History for aleatoric

aleatory

adj.

"of uncertain outcome," literally "depending on the throw of a die," 1690s, from Latin aleatorius "pertaining to a gamester," from aleator "a dice player," from alea "a game with dice; chance, hazard, risk; a die, the dice;" perhaps literally "a joint-bone, a pivot-bone," and related to axis.

Online Etymology Dictionary, © 2010 Douglas Harper
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