[fuh-mil-ee-ar-i-tee, -mil-yar-]
noun, plural familiarities.
thorough knowledge or mastery of a thing, subject, etc.
the state of being familiar; friendly relationship; close acquaintance; intimacy.
an absence of ceremony and formality; informality.
freedom of behavior justified only by the closest relationship; undue intimacy.
Often, familiarities. an instance of such freedom, as in action or speech.
a sexual liberty or impropriety.

1350–1400; Middle English familiarite (< Anglo-French) < Latin familiāritās intimacy. See familiar, -ity

overfamiliarity, noun
prefamiliarity, noun

3. unconstraint. 4. liberty, freedom, license.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
familiarity (fəˌmɪlɪˈærɪtɪ)
n , pl -ties
1.  reasonable knowledge or acquaintance, as with a subject or place
2.  close acquaintanceship or intimacy
3.  undue intimacy
4.  (sometimes plural) an instance of unwarranted intimacy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1200, from Fr. familiarité, from L. familiaritatem, from familiaris "friendliness, intimacy" (see familiar). Meaning "undue intimacy" is from late 14c. That of "close acquaintance" is from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When it all works, innovation does come at the expense of familiarity.
The human mind often confuses familiarity with understanding.
Familiarity occurs quickly, before the brain can recall the source of the
Even more important, however, is familiarity of the text.
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