Meaning of the word familiarity in English

What does familiarity mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

familiarity

US /fəˌmɪl.iˈer.ə.t̬i/
UK /fəˌmɪl.iˈær.ə.ti/

Noun

1.

close acquaintance with or knowledge of something

Example:
His familiarity with the subject was evident in his detailed explanation.
She gained familiarity with the software after weeks of practice.
2.

informal behavior; excessive casualness

Example:
His familiarity with the boss was sometimes inappropriate.
Don't mistake my kindness for familiarity.