|āˌpirē|ädik, ā|p- adjective
Etymology: a- (II) + periodic
1. : of irregular occurrence : not periodic
aperiodic floods
2. : not having periodic vibrations : nonoscillatory and hence capable of moving steadily to a position of equilibrium
3. cryptology : not repeating or not repeating with a short or easily discoverable period
an aperiodic key
• ape·ri·od·i·cal·ly -də̇k(ə)lē adverb
• ape·ri·o·dic·i·ty |āˌpirēəˈdisəd.ē noun -es