The word "aleatory" is derived from the Latin word for a die. What is aleatory depends on "the throw of a die," upon 'uncertain contingencies." --it is a matter of chance. See John Cage's writings.
see probability Should we divide the order of movement from the order of reading?
Jacques Donzelot describes "aleatory spaces" "such as the vacant lot and the street, where sexual and amorous initiations were carried out."