fa·mil·iar fəˈmilyər/Submit adjective 1. well known from long or close association. “their faces will be familiar to many of you” 2. in close friendship; intimate. “she had not realized they were on such familiar terms” synonyms: informal, casual, relaxed, easy, comfortable; More noun 1. a demon supposedly attending and obeying a witch, often said to assume the form of an animal. 2. (in the Roman Catholic Church) a person rendering certain services in a pope’s or bishop’s household.