irregular irregular /ˌɪˈrɛgjəlɝ/

adjective

1. () Contrary to rule or accepted order or general practice  ( irregular )
   contrary to rule or accepted order or general practice
    Irregular hiring practices
   irregular hiring practices
   
2. () Not occurring at a regular rate or fixed intervals  ( unpredictable , irregular )
   not occurring at a regular rate or fixed intervals
    An irregular heartbeat
   an irregular heartbeat
   
3. Independent in behavior or thought  ( irregular , maverick , unorthodox )
   independent in behavior or thought
    She led a somewhat irregular private life
   she led a somewhat irregular private life
    Maverick politicians
   maverick politicians
   
4. (of a surface or shape); not level or flat or symmetrical  ( irregular )
   (of a surface or shape); not level or flat or symmetrical
    Walking was difficult on the irregular cobblestoned surface
   walking was difficult on the irregular cobblestoned surface
   
5. Lacking continuity or regularity  ( irregular , temporary )
   lacking continuity or regularity
    An irregular worker
   an irregular worker
    Employed on a temporary basis
   employed on a temporary basis
   
6. Deviating from normal expectations; somewhat odd, strange, or abnormal  ( atypical , irregular )
   deviating from normal expectations; somewhat odd, strange, or abnormal
    These days large families are atypical
   these days large families are atypical
    Atypical clinical findings
   atypical clinical findings
    Atypical pneumonia
   atypical pneumonia
    Highly irregular behavior
   highly irregular behavior
   
7. Failing to meet a standard of manufacture due to an imperfection  ( irregular )
   failing to meet a standard of manufacture due to an imperfection
    An irregular pair of jeans
   an irregular pair of jeans
   
8. (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement  ( irregular )
   (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
   
9. (used of the military) not belonging to or engaged in by regular army forces  ( irregular )
   (used of the military) not belonging to or engaged in by regular army forces
    Irregular troops
   irregular troops
    Irregular warfare
   irregular warfare
   

noun

1. Merchandise that has imperfections; usually sold at a reduced price without the brand name  ( irregular , second )
   merchandise that has imperfections; usually sold at a reduced price without the brand name
   
2. A member of an irregular armed force that fights a stronger force by sabotage and harassment  ( guerilla , insurgent , irregular , guerrilla )
   a member of an irregular armed force that fights a stronger force by sabotage and harassment
     The guerrilla fighters launched surprise attacks against the occupying forces.
   The guerrilla fighters launched surprise attacks against the occupying forces.