lacking continuity or regularity; "an irregular worker"; "employed on a temporary basis"
deviating from normal expectations; somewhat odd, strange, or abnormal; "these days large families are atypical"; "atypical clinical findings"; "atypical pneumonia"; "highly irregular behavior"
falling below the manufacturer's standard; "irregular jeans"
merchandise that has imperfections; usually sold at a reduced price without the brand name
contrary to rule or accepted order or general practice; "irregular hiring practices"
a member of an irregular armed force that fights a stronger force by sabotage and harassment
(of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
(used of the military) not belonging to or engaged in by regular army forces; "irregular troops"; "irregular warfare"