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familiarity

[fuh-mil-ee-ar-i-tee, -mil-yar-] /fəˌmɪl iˈær ɪ ti, -mɪlˈyær-/
noun, plural familiarities.
1.
thorough knowledge or mastery of a thing, subject, etc.
2.
the state of being familiar; friendly relationship; close acquaintance; intimacy.
3.
an absence of ceremony and formality; informality.
4.
freedom of behavior justified only by the closest relationship; undue intimacy.
5.
Often, familiarities. an instance of such freedom, as in action or speech.
6.
a sexual liberty or impropriety.
Origin
1350-1400
1350-1400; Middle English familiarite (< Anglo-French) < Latin familiāritās intimacy. See familiar, -ity
Related forms
overfamiliarity, noun
prefamiliarity, noun
Synonyms
3. unconstraint. 4. liberty, freedom, license.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for familiarities

familiarity

/fəˌmɪlɪˈærɪtɪ/
noun (pl) -ties
1.
reasonable knowledge or acquaintance, as with a subject or place
2.
close acquaintanceship or intimacy
3.
undue intimacy
4.
(sometimes pl) an instance of unwarranted intimacy
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
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Word Origin and History for familiarities
familiarity
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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