familiarity

noun

1.
personal knowledge or information about someone or something
couthness acquaintance conversance conversancy
Derived from:
familiar
2.
usualness by virtue of being familiar or well known
Antonym:
unfamiliarity
Derived from:
familiar
3.
4.
a casual manner
casualness
5.
an act of undue intimacy
impropriety indecorum liberty