Synonyms of familiarity

1. acquaintance, familiarity, conversance, conversancy, information: usage: personal knowledge or information about someone or something
2. familiarity, usualness: usage: usualness by virtue of being familiar or well known
3. familiarity, intimacy, closeness, friendliness: usage: close or warm friendship; "the absence of fences created a mysterious intimacy in which no one knew privacy"
4. casualness, familiarity, informality: usage: a casual manner
5. familiarity, impropriety, indecorum, liberty, misbehavior, misbehaviour, misdeed: usage: an act of undue intimacy