UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌeɪpɪərɪˈɒdɪk/US:USA pronunciation: respellingUSA pronunciation: respelling(ā′pēr ē odik)

WordReference Random House Unabridged Dictionary of American English © 2020
a•pe•ri•od•ic  (ā′pēr ē odik),USA pronunciation adj. 
  1. not periodic; irregular.
  2. Physicsof or pertaining to vibrations or oscillations with no apparent period.
a′pe•ri•odi•cal•ly, adv. 
a•pe•ri•o•dic•i•ty  (ā′pēr ē odik),USA pronunciation n. 
  • a-6 + periodic 1875–80

Collins Concise English Dictionary © HarperCollins Publishers::
aperiodic /ˌeɪpɪərɪˈɒdɪk/ adj
  1. not periodic; not occurring at regular intervals
  2. (of a system or instrument) being damped sufficiently to reach equilibrium without oscillation
  3. (of an oscillation or vibration) not having a regular period
  4. (of an electrical circuit) not having a measurable resonant frequency

aperiodicity /ˌeɪpɪərɪəˈdɪsɪtɪ/ n
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