- irregular
- ir•reg•u•lar[[t]ɪˈrɛg yə lər[/t]] adj.1) lacking symmetry, even shape, formal arrangement, etc.:an irregular pattern[/ex]2) variable in timing or rhythm; erratic:irregular intervals[/ex]3) not conforming to established rules, etiquette, morality, etc4) not according to rule or to the accepted principle, method, course, order, etc5) gram. not conforming to the prevalent pattern of formation, inflection, etc., in a language, as English verbs that do not form the past tense by adding -ed: the irregular verbs keep and see6) mil (formerly, of troops) not belonging to an organized group of established military forces7) flawed, damaged, or failing to meet a specific standard of manufacture:a sale of irregular shirts[/ex]8) bot Bot. lacking uniformity, as a flower with petals of varied shapes9) a person or thing that is irregular10) com a product or material that does not meet specifications or standards of the manufacturer, as one having imperfections in its pattern11) mil a combatant not of a regular military force, as a guerrilla•Etymology: 1350–1400; < ME < MF < LL
From formal English to slang. 2014.