1.Definition: (of a surface or shape); not level or flat or symmetrical

"Walking was difficult on the irregular cobblestoned surface"

2.Definition: (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement

3.Definition: (used of the military) not belonging to or engaged in by regular army forces

"Irregular troops", "Irregular warfare"

4.Definition: contrary to rule or accepted order or general practice

"Irregular hiring practices"

5.Definition: deviating from normal expectations; somewhat odd, strange, or abnormal

"Highly irregular behavior"

Related Adjective(s):atypical

6.Definition: failing to meet a standard of manufacture due to an imperfection

"An irregular pair of jeans"

7.Definition: independent in behavior or thought

"She led a somewhat irregular private life"

Related Adjective(s):maverick, unorthodox

8.Definition: lacking continuity or regularity

"An irregular worker"

Related Adjective(s):temporary

9.Definition: not occurring at a regular rate or fixed intervals

"An irregular heartbeat"

Related Adjective(s):unpredictable