/ay"lee euh tawr'ee, -tohr'ee, al"ee-/ , adj.
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 /ay'lee euh tawr"ik, -tor"-, al'ee-/ .
[ 1685-95; aleatorius, equiv. to aleator- (s. of aleator gambler ( ale ( a ) game of chance + -ator -ATOR) + -ius adj. suffix; see -TORY 1 ]