a·le·a·to·ry

[ey-lee-uh-tawr-ee, -tohr-ee, al-ee-]
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, a·le·a·tor·ic [ey-lee-uh-tawr-ik, -tor-, al-ee-] .


Origin:
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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Cite This Source Link To Aleatory
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Aleatory is always a great word to know.
So is gobo. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
aleatory or aleatoric (ˈeɪlɪətərɪ, -trɪ, ˌeɪlɪəˈtɒrɪk) [Click for IPA pronunciation guide]
 
adj
1.  dependent on chance
2.  (esp of a musical composition) involving elements chosen at random by the performer
 
[C17: from Latin āleātōrius, from āleātor gambler, from ālea game of chance, dice, of uncertain origin]
 
aleatoric or aleatoric
 
adj
 
[C17: from Latin āleātōrius, from āleātor gambler, from ālea game of chance, dice, of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

aleatory
"of uncertain outcome," lit. "depending on the throw of a die," 1690s, from L. aleatorius, from aleator "a dice player," from alea "a die, the dice."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Aleatory risks versus short-run hedonism in explanation of gang action.
The aleatory and epistemic uncertainty can be combined into a composite
  variability.
The first type of uncertainty is aleatory uncertainty.
Aleatory uncertainty cannot be reduced by collection of additional information.
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