familiarity: Meaning and Definition of

fa•mil•i•ar•i•ty

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,an instance of such freedom, as in action or speech.
6. a sexual liberty or impropriety.