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Adjective irregular has 9 senses
- irregular - contrary to rule or accepted order or general practice; "irregular hiring practices"
 
Antonyms:  regular, daily, day-to-day, day-after-day, every day, first-string, lawful, orderly, rule-governed, official, prescribed, regularized, regularised, routine, standard, stock, timed, well-ordered, uniform, weak
 
 - irregular - (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
 
Antonym:  regular
 
 - irregular, unpredictable - not occurring at expected times
 
Antonym:  continual (indirect, via sporadic) 
 - irregular - used of the military; not belonging to or engaged in by regular army forces; "irregular troops"; "irregular warfare"
 
Antonyms:  regular, standing
 
 - atypical, irregular - deviating from what is usual or common or to be expected; often somewhat odd or strange; "these days large families are atypical"; "highly irregular behavior"
 
Antonym:  normal (indirect, via abnormal) 
 - irregular, temporary - lacking continuity or regularity; "an irregular worker"; "employed on a temporary basis"
 
Antonym:  full-time (indirect, via part-time) 
 - irregular - of a surface; not level or flat; "walking was difficult on the irregular cobblestoned surface"
 
Antonym:  even (indirect, via uneven) 
 - guerrilla, guerilla, underground, irregular - used of independent armed resistance forces; "guerrilla warfare"; "partisan forces"
 
Antonyms:  nonpartisan, nonpartizan (indirect, via partisan) 
 - irregular, maverick, unorthodox - independent in behavior or thought; "she led a somewhat irregular private life"; "maverick politicians"
 
Antonym:  conventional (indirect, via unconventional) 
  
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