aperiodic

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aperiodic

[¦a‚pir·ē¦äd·ik]
(physics)
Of irregular occurrence; not periodic; not displaying resonant response.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The Assessor is an RtUnit which may run its job either periodically, at every predefined period, or aperiodically after every adaptation loop execution.
They vibrate aperiodically (irregularly), often at two different frequencies, or with very sudden and transient changes in frequency.
Each VI schedule specified that food became available aperiodically, with the average time between successive food availabilities equal to the schedule value (e.g., 60 s under a VI 60-s schedule), and was delivered dependent on a keypeck response.
Compared with the number of distractors, targets occurred aperiodically and without forewarnings.