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.
What an amazing word. Sort of like synchronicity but without any secret universal ’cause.’