| 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.
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| 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. |
irregular ir·reg·u·lar (ĭ-rěg'yə-lər)
adj.
Not straight, uniform, or symmetrical, as facial features.
Of uneven rate, occurrence, or duration, as a heartbeat.
Deviating from a type; atypical.