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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 ?
The movements of the patient have the characteristics of high amplitude, asymmetry, and aperiodicity. Therefore, a pelvic support robot should meet all motion requirements with joint compliance to avoid rigid impact and secondary damage.
Secondly, though the aperiodicity nature of a chaotic system will be deteriorated in computer realization with finite computation precision, the period length of pseudorandom keystream sequence generated by a chaotic system is by far longer than that of its discretized version.
The crystalline and amorphous domains can be efficiently characterized by several instrumental techniques such as the widely employed electron microscopy (SEM [11], TEM [12]), X-Ray Diffraction (XRD) [8,13], Raman spectroscopy [7], and, less frequently, Neutron Diffraction (ND) [14], while the structure of the domains damaged by irradiation is not well known due to the aperiodicity of the system [10, 15].
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.