noun, plural informalities for 2.
the state of being informal; absence of formality.
an informal act.

1590–1600; in-3 + formality

superinformality, noun, plural superinformalities. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
informality (ˌɪnfɔːˈmælɪtɪ)
n , pl -ties
1.  the condition or quality of being informal
2.  an informal act

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Delighted by the island chain's climate, informality and remoteness, the couple
  extended their stay to four months.
When a question is considered informally, the proceedings should be kept as
  usual, as the only informality is in the debate.
If ever in doubt what to wear, the best rule is to err on the side of
But about twenty years ago the era of informality set in and has been gaining
  ground ever since.
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