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.

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

Contemporary Examples of irregularity

  • When the spotlight shines on their lives, the glare makes every irregularity evident.

    The Daily Beast logo
    Whistleblowers Are Weird

    Megan McArdle

    June 10, 2013

Historical Examples of irregularity

  • The irregularity of the proceeding was unnoticed in the tense excitement.

    The Underdog

    F. Hopkinson Smith

  • Irregularity and pain in menstruation are a frequent cause of neuroticism.

  • The use of either instrument, when unaccompanied, leads to every sort of irregularity and trickery.



  • The irregularity of the meeting must be assigned to the enactment against which it offended.

    The Snare

    Rafael Sabatini

  • There should be no plundering, no irregularity, no disregard of general orders.

    The Snare

    Rafael Sabatini

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