irregular (Adjective) — Contrary to rule or accepted order or general practice. ex. "irregular hiring practices"
irregular (Adjective) — Not occurring at expected times.
irregular (Adjective) — (used of the military) not belonging to or engaged in by regular army forces. ex. "irregular troops" ex. "irregular warfare"
irregular (Adjective) — (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement.
irregular (Adjective) — Falling below the manufacturer's standard. ex. "irregular jeans"
irregular (Adjective) — Deviating from normal expectations; somewhat odd, strange, or abnormal. ex. "highly irregular behaviour"
irregular (Adjective) — Lacking continuity or regularity. ex. "an irregular worker"
irregular (Adjective) — (of a surface or shape); not level or flat or symmetrical. ex. "walking was difficult on the irregular cobblestoned surface"
irregular (Adjective) — Independent in behaviour or thought. ex. "she led a somewhat irregular private life"
irregular (Noun) — A member of an irregular armed force that fights a stronger force by sabotage and harassment.
irregular (Noun) — Merchandise that has imperfections; usually sold at a reduced price without the brand name.