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Definitions for Irregular

[1] without symmetry, even shape, formal arrangement, etc.: an irregular pattern.
[2] not characterized by any fixed principle, method, continuity, or rate: irregular intervals.
[3] not conforming to established rules, customs, etiquette, morality, etc.: highly irregular behavior.
[4] not according to rule, or to the accepted principle, method, course, order, etc.
[5] Grammar . not conforming to the prevalent pattern or patterns of formation, inflection, construction, etc., of a language; having a rule descriptive of a very small number of items: The English verbs “keep” and “see” are irregular in their inflections.
[6] Military . (formerly, of troops) not belonging to an organized group of the established forces.
[7] flawed, damaged, or failing to meet a specific standard of manufacture: a sale of irregular shirts.
[8] Botany . not uniform. (of a flower) having the members of some or all of its floral circles or whorls differing from one another in size or shape, or extent of union.
[9] deviating or experiencing deviations from a normally regular or cyclic body function, as bowel habits or menstruation.
[10] (of a stock or commodity market) of mixed market activity; showing no clear up or down trend.
[11] a person or thing that is irregular.
[12] Commerce . a product or material that does not meet specifications or standards of the manufacturer, as one having imperfections in its pattern.
[13] Military . a soldier or combatant not of a regular military force, as a guerrilla or partisan.
[14] lacking uniformity or symmetry; uneven in shape, position, arrangement, etc
[15] not occurring at expected or equal intervals an irregular pulse
[16] differing from the normal or accepted practice or routine
[17] not according to established standards of behaviour; unconventional
[18] (of the formation, inflections, or derivations of a word) not following the usual pattern of formation in a language, as English plurals ending other than in -s or -es
[19] of or relating to guerrillas or volunteers not belonging to regular forces irregular troops
[20] (of flowers) having any of their parts, esp petals, differing in size, shape, etc; asymmetric
[21] US (of merchandise) not up to the manufacturer's standards or specifications; flawed; imperfect
[22] a soldier not in a regular army
[23] (often plural) US imperfect or flawed merchandise Compare second 1 (def. 15)

Words related to Irregular

uneven, intermittent, capricious, unreliable, sporadic, jerky, erratic, unusual, inappropriate, improper, strange, unorthodox, lumpy, asymmetrical, elliptical, jagged, craggy, unbalanced, eccentric, aberrant

Words nearby Irregular

irrefragable, irrefrangible, irrefutable, irreg., irregardless, irregular, irregular astigmatism, irregular bone, irregular dentin, irregular flower, irregular galaxy

Origin of Irregular

1350–1400; < Late Latin irrēgulāris (see ir-2, regular); replacing Middle English irreguler < Middle French

Other words from Irregular

ir·reg·u·lar·ly , adverb
qua·si-ir·reg·u·lar , adjective
qua·si-ir·reg·u·lar·ly , adverb

Synonyms for Irregular

capricious, erratic, intermittent, jerky, sporadic, uneven, unreliable, aberrant, eccentric, faltering, shifting, weaving, aimless, casual, changeable, designless, desultory, disconnected, discontinuous, fitful, fluctuating, fragmentary, haphazard, hit-or-miss, inconstant, indiscriminate, infrequent, nonuniform, occasional, out of order, patchy, purposeless, recurrent, shaky, spasmodic, uncertain, unconsidered, unmethodical, unpunctual, unsettled, unsteady, unsystematic, up and down