definition of
irregular

[1] #1 irregular a. contrary to rule or accepted order or general practice; "irregular hiring practices". wn

[2] #2 irregular s. [unpredictable] not occurring at expected times. wn

[3] #3 irregular n. [guerrilla, guerilla, insurgent] a member of an irregular armed force that fights a stronger force by sabotage and harassment. wn

[4] #4 irregular n. [second] merchandise that has imperfections; usually sold at a reduced price without the brand name. wn

[5] #5 irregular a. (used of the military) not belonging to or engaged in by regular army forces; "irregular troops"; "irregular warfare". wn