noun, plural ir·reg·u·lar·i·ties for 2, 3.

the quality or state of being irregular.
something irregular.
a breach of rules, customs, etiquette, morality, etc.
occasional mild constipation.

Nearby words

  1. irregular dentin,
  2. irregular flower,
  3. irregular galaxy,
  4. irregular variable,
  5. irregular verb,
  6. irrelative,
  7. irrelatively,
  8. irrelevance,
  9. irrelevancy,
  10. irrelevant

Origin of irregularity

1275–1325; Middle English irregularite < Old French < Medieval Latin irrēgulāritās. See ir-2, regularity Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for irregularity

British Dictionary definitions for irregularity


noun plural -ties

the state or quality of being irregular
something irregular, such as a bump in a smooth surface
a breach of a convention or normal procedure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for irregularity



early 14c., "violation of Church rules," from Old French irregularité (14c.) and directly from Medieval Latin irregularitas, from irregularis (see irregular). Meaning "state of being not regular" is from 1590s.

Online Etymology Dictionary, © 2010 Douglas Harper