Fa*mil`iar"i*ty (?), n.; pl. Familiarities (#). [OE. familarite, F. familiaritéfr. L. faniliaritas. See Familiar.] 1. The state of being familiar; intimate and frequent converse, or association; unconstrained intercourse; freedom from ceremony and constraint; intimacy; as, to live in remarkable familiarity.

2. Anything said or done by one person to another unceremoniously and without constraint; esp., in the pl., such actions and words as propriety and courtesy do not warrant; liberties.

Syn. -- Acquaintance; fellowship; affability; intimacy. See Acquaintance.

• The state of being extremely friendly; intimacy.
  
• Undue intimacy.
  
• Sexual intimacy.
  
• Informality; impertinence.
  
• An instance of familiar behaviour.
  
• Close or habitual acquaintance with someone; recognizability.