Familiarity

[Sonia]

The state of being familiar; intimate and frequent
converse, or association; unconstrained intercourse; freedom from
ceremony and constraint; intimacy; as, to live in remarkable
familiarity.

[Gregory]

It means [in like] [a friendly] type manner or sometimes they [dont care] about you and they add that to make you seem that they seem youre important even though they dont care

[Sommer]

Close acquaintance with or knowledge of something.

[Zipporah Schumaker]

a good knowledge of something, or the fact that you know it so well: