familiarity

英 [fəmɪlɪ'ærɪtɪ] 美[fə,mɪlɪ'ærəti]

• n. 熟悉，精通；亲密；随便

1. personal knowledge or information about someone or something

2. usualness by virtue of being familiar or well known

3. close or warm friendship;

"the absence of fences created a mysterious intimacy in which no one knew privacy"

4. a casual manner

5. an act of undue intimacy