/feuh mil'ee ar"i tee, -mil yar"-/ , n. , pl. 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.
[ 1350-1400; ME familiarite ( familiaritas intimacy. See FAMILIAR, -ITY ]
Syn. 3. unconstraint. 4. liberty, freedom, license.