irregularity

 
Pronunciation: /ɪˌrɛgjuˈlarɪti/

noun (plural irregularities)

[mass noun]
  • the state or quality of being irregular: there is evidence that fraud and irregularity continue on a large scale the irregularity of his breathing
  • [count noun] (usually irregularities) a thing that is irregular in form or nature: irregularities of the heartbeat financial irregularities

Origin:

Middle English: from Old French irregularite, from late Latin irregularitas, from irregularis (see irregular)