familiarity
/fəˌmɪlɪˈærətɪ/noun
(pl. -ies)［mass noun］
1- close acquaintance with or knowledge of something熟悉, 熟知; 通晓：
increase customer familiarity with a product.
增加顾客对产品的了解。
1.1
- the quality of being well known; recognizability based on long or close association知名（度）; 熟识（度）：
the reassuring familiarity of his parents' home.
他父母家的那种令人宽慰的熟识感。
1.2
- relaxed friendliness or intimacy between people亲近; 亲密：
familiarity allows us to give each other nicknames.
因为关系亲密, 我们可以互起绰号。
1.3
- inappropriate and often offensive informality of behaviour or language（言行的）随便; 放肆：
the unnecessary familiarity made me dislike him at once.
他那种不必要的、不拘礼节的举动使我顿时觉得他很讨厌。
短语
familiarity breeds contempt
- proverb extensive knowledge of or close association with someone or something leads to a loss of respect for them or it〈谚〉亲不敬, 熟生蔑。
词源
Middle English （in the senses 'close relationship' and 'sexual intimacy'）： via Old French from Latin familiaritas, from familiaris 'familiar, intimate' （see FAMILIAR）.