irregular.
Nonstandard; not conforming to rules or expectations.
Meaning & usage
Nonstandard; not conforming to rules or expectations.
Of a surface, rough.
Without symmetry, regularity, or uniformity.
Of a polygon, not regular; having sides that are not equal or angles that are not equal.
Of a polyhedron, whose faces are not all regular polygons (or are not equally inclined to each other).
Of a word, not following the regular or expected patterns of inflection in a given language.
"Calves", "cacti", and "children" are irregular plurals.
"To buy" is an irregular English verb: its past simple and past participle tense is "bought".
Having abnormal bowel movements at inconsistent intervals.
Where this word comes from
From Middle English irreguler, from Old French irreguler, from Medieval Latin or Late Latin irrēgulāris, from in- + regularis, equivalent to ir- + regular.
A soldier who is not a member of an official military force and who may not use regular army tactics.
One who does not regularly attend a venue.
Where this word comes from
From Middle English irreguler, from Old French irreguler, from Medieval Latin or Late Latin irrēgulāris, from in- + regularis, equivalent to ir- + regular.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.