personal knowledge or information about someone or something
"Her familiarity with the local subway system allowed her to help tourists find their way easily."
usualness by virtue of being familiar or well known
"The casual atmosphere in the office gave everyone a sense of familiarity that made new employees feel welcomed immediately."
close or warm friendship
"the absence of fences created a mysterious intimacy in which no one knew privacy"
a casual manner
"She spoke to the CEO with such familiarity that everyone in the room felt out of place."
an act of undue intimacy
"Her constant commenting on his personal habits felt less like concern and more like a disturbing familiarity between strangers."
The state of being extremely friendly; intimacy.
"After years of working side by side, they shared a familiarity that made them feel like old friends despite never having met before."