irregularity Definition

irregular
adj

1. Not happening or occurring at regular or equal intervals.

Thesaurus: inconstant, erratic, uneven, spasmodic, occasional, intermittent, discontinuous, sporadic, random, capricious, haphazard, casual; Antonym: constant, steady, systematic, methodical.
2. Not smooth, even or balanced.

Thesaurus: amorphous, shapeless, jagged, distorted, lumpy, eccentric, elliptical, devious, aberrant, variable; Antonym: symmetrical, aligned.
3. Not conforming to rules, custom, accepted or normal behaviour, or to routine.

Thesaurus: questionable, strange, debatable; Antonym: proper.
4. grammar.
Said of a word, especially a verb or noun: not changing its form (eg to show tenses or plurals) according to the usual patterns in the language.
5. Said of troops: not belonging to the regular army.

noun

1. An irregular soldier.

Derivative: irregularity
noun

Derivative: irregularly
adverb

Etymology: 14c.