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Answer for the clue "Irregular ", 9 letters:
aperiodic

Word definitions for aperiodic in dictionaries

Wikipedia Word definitions in Wikipedia
Aperiodic means non-periodic. Typically it refers to aperiodic function . It may also refer to: Aperiodic finite state automaton Aperiodic frequency Aperiodic graph Aperiodic semigroup Aperiodic set of prototiles Aperiodic tiling

WordNet Word definitions in WordNet
adj. not recurring at regular intervals [syn: nonperiodic ] [ant: periodic ]

Wiktionary Word definitions in Wiktionary
a. 1 That does not recur periodically 2 (context physics English) That does not have a periodic vibration 3 (context mathematics stochastic processes of a state English) for which any return to it may occur at irregular times; not periodic.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1874, from a- (2), privative prefix, + periodic .

Usage examples of aperiodic.

The awesome, aperiodic double helixwith its seductive suggestion of encoded information assembling an entire organismspread before him at twenty-one, wider than the American Wilderness.

Life, ordered irregularity, aperiodic crystal, signal in a field of noise, required that wonder and reverence, both coded for, beat out success if anything is to survive.

Conway may also have done some work on aperiodic four-dimensional and five-dimensional tessellations.

The locus for this singularity will be shown to be unstable in the sense of Poincare and to be subject to aperiodic shifts in its locus due to endogenous factors.

This might explain why, even today, and doubtless numerous genetic codings later, codings obviously favoring frequent and aperiodic sexuality, some women are, so to speak, in addition, still “called by the moon.

Normally, one begins by figuring out, based on certain patterns in the ciphertext, whether it is, for example, a substitution or a transposition system, and then further classifying it into, say, an aperiodic transposition cipher in which keying units of constant length encipher plaintext groups of variable length, or vice versa.