familiarity

noun
1
the state of knowing somebody/something well; the state of recognizing somebody/something
آشنایی, شناخت
2
a friendly informal manner
صمیمیت, خودمانی بودن, آشنایی صمیمانه
She addressed me with an easy familiarity that made me feel at home.
He treated her with the easy familiarity of an equal.