Definition of: familiar

(fə·mil′yər) adjective
1. Having close knowledge; well acquainted; thoroughly versed; followed by with.
2. Having the relation of an intimate or near friend; arising from or characterized by close acquaintance; not distant; informal.
3. Exercising undue intimacy; forward; intrusive.
4. Well known, as from habitual use or long acquaintance; common; frequent; customary.
5. Domesticated; attached: said of animals. See synonyms under COMMON, GENERAL, HABITUAL, USUAL.
—noun
1. An intimate friend.
2. A person with whom one frequently associates.
3. A spirit supposed to attend and obey a sorcerer: also familiar spirit.
4. A servant of a prelate of the Roman Catholic Church, or the inquisition. [<L familiaris of the family <familia family]
—fa·mil′iar·ly adverb