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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 ?
On the one hand, these conditions include irreducibility and aperiodicity of the underlying graph of the Markov chain, which can be checked easily for a given Markov chain.
Greater aperiodicity of vibration may show up as greater noise in the spectrum and lesser HNR.
In some instances the solvent molecules stack over each other in an aperiodic manner; in fact it is this aperiodicity [3] than cannot be modeled in a regular refinement so that the contribution must be estimated.
It is expected then, that the aperiodicity in the genome would be related to highly polymorphic genomic aperiodic structures and those periodic regions with highly repetitive and not very polymorphic genomic structures.
Systems with chaotic dynamics share the following features (Mathews, White & Long, 1999): firstly, they show aperiodicity, that is, they are systems whose dynamics never pass twice through the same state; secondly, the dynamic behavior of the system stays within a finite range of values, after which it is self-contained; thirdly, the dynamic is deterministic, that is, it is regulated by rules; and fourthly, the system shows sensitive dependence on initial conditions, in other words, two starting points, no matter how close together, will give rise to very different evolutions of the system.
In this regard, art history has inadvertently given us the means of attributing aberrance to the art of our age, since the current pluralism contradicts the historical model of a succession of discrete period or cultural styles as blatantly as the aperiodicity of chaos contradicts the regularity of the clockwork universe.