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aleatory

[ey-lee-uh-tawr-ee, -tohr-ee, al-ee-]
adjective
  1. Law. depending on a contingent event: an aleatory contract.
  2. of or relating 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.
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Also a·le·a·tor·ic [ey-lee-uh-tawr-ik, -tor-, al-ee-] /ˌeɪ li əˈtɔr ɪk, -ˈtɒr-, ˌæl i-/.

Origin of aleatory

1685–95; < Latin āleātōrius, equivalent to āleātōr- (stem of āleātor gambler (āle(a) game of chance + -ātor -ator) + -ius adj. suffix; see -tory1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aleatoric

aleatory

aleatoric (ˌeɪlɪəˈtɒrɪk)

adjective
  1. dependent on chance
  2. (esp of a musical composition) involving elements chosen at random by the performer
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.

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Online Etymology Dictionary, © 2010 Douglas Harper