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noun, plural in·for·mal·i·ties for 2.
  1. the state of being informal; absence of formality.
  2. an informal act.
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Origin of informality

First recorded in 1590–1600; in-3 + formality
Related formssu·per·in·for·mal·i·ty, noun, plural su·per·in·for·mal·i·ties.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for informality


noun plural -ties
  1. the condition or quality of being informal
  2. an informal act
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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 informality


1590s, from informal + -ity.

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Online Etymology Dictionary, © 2010 Douglas Harper