Also found in: Thesaurus, Medical, Encyclopedia.


Occurring without periodicity; irregular.

a′pe·ri·od′i·cal·ly adv.
a·pe′ri·o·dic′i·ty (-ə-dĭs′ĭ-tē) n.


1. not periodic; not occurring at regular intervals
2. (General Physics) physics
a. (of a system or instrument) being damped sufficiently to reach equilibrium without oscillation
b. (of an oscillation or vibration) not having a regular period
c. (of an electrical circuit) not having a measurable resonant frequency
ˌaperiˈodically adv
aperiodicity n


(ˌeɪ pɪər iˈɒd ɪk)

1. not periodic; irregular.
2. Physics. of or pertaining to vibrations or oscillations with no apparent period.
a`pe•ri•od′i•cal•ly, adv.
a•pe`ri•o•dic′i•ty (-əˈdɪs ɪ ti) n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.aperiodic - not recurring at regular intervals
periodic, periodical - happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"
References in periodicals archive ?
Here update transactions follow an aperiodic task framework in the deferrable scheduling algorithm.
Persistence of oviposition rhythm in individuals of Drosophila melanogaster reared in an aperiodic environment for several hundred generations.
Figure 1: Comparison of two major methods of random number generation Method Comparison Pseudo-Random True Random Number Generators Number Generators Efficient Inefficient Deterministic Nondeterministic Periodic Aperiodic Figure 2: Example of an equation to generate Pseudo-Random Number Generators Random Number Generator Equation [x.
The Flaskin Shellfish Research Laboratory (2012) argued, based on this analysis, that stock stability was the most important objective, and that stability of the market-size population was the most desirable approach because, even with aperiodic disease epizootics, this component of the population was inherently more stable temporally, and is also more important reproductively and as the principal carbonate producer.
Aperiodic examination of usage and engagement with traditional and digital media channels serving the agricultural industry,
Periodic binary complementary sequence sets are signals of this kind, which have such properties: the sum of aperiodic autocorrelation of sequences is zero everywhere except "0" shift [2], in practice odd-periodic correlation function is of same importance as periodic correlation function, on certain conditions, periodic binary complementary sequences sets and odd-periodic binary sequences sets can transform into each other [3-4].
Thus, for instance, between "danse" and "fantasques" we may find a "feminine" rhyme like "passe" (Excerpt 6), which ends with a fricative that, though continuous, is aperiodic and the syllable contains no nasal vowel.
The problem of the aperiodic vibration of a beam with any curvature and a variable cross section was solved using the Frobenius method combined with the dynamic stiffness method and the Laplace transformation in Huang et al.
of Bayreuth, Germany) has written a clear guide to aperiodic crystallography that will be essential to scientists seeking to learn of their special structural features, including the atomic structures of modulated and composite crystals from diffraction data.
in the case where J = 1 - P for some aperiodic power series with nonnegative coefficients P, CONTRIB(n) = {c}.
Chaos has been defined as having deterministic aperiodic behavior with initial condition dependence (1).
Chapter 18: Aperiodic Resonant Excitation of Microprocessor Power Distribution Systems and the Reverse Pulse Technique