noun, plural irregularities for 2, 3.
the quality or state of being irregular.
something irregular.
a breach of rules, customs, etiquette, morality, etc.
occasional mild constipation.

1275–1325; Middle English irregularite < Old French < Medieval Latin irrēgulāritās. See ir-2, regularity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irregularity (ɪˌrɛɡjʊˈlærɪtɪ)
n , pl -ties
1.  the state or quality of being irregular
2.  something irregular, such as a bump in a smooth surface
3.  a breach of a convention or normal procedure

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Hence the humorous kernel inside that little irregularity during the oath.
Yet stand by the sea and watch the irregularity of its edge, and you begin to
Election observers found no evidence of serious irregularity.
So unless some sort of procedural irregularity has occurred during the trial
  any appeal has to be based on the judge's summing-up.
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