familiarity
fa-mil-i-ar-i-ty
noun
Informal or intimate behaviour, sometimes considered inappropriate or disrespectful.
"She disliked his sudden familiarity."
noun
Close knowledge or understanding of something or someone through experience.
"His familiarity with the city was evident."
Thesaurus
Synonyms: intimacy, closeness, conversancy, conversance, acquaintance, impropriety, indecorum, liberty, casualness
Antonyms: strangeness, unfamiliarity