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