n. (pl. -ies) 1 the state of being well known (the familiarity of the scene). 2 (foll. by with) close acquaintance. 3 a close relationship. 4 a sexual intimacy. b (in pl.) acts of physical intimacy. 5 familiar or informal behaviour, esp. excessively so.
[ ME f. OF familiarité f. L familiaritas -tatis (as FAMILIAR) ]