Familiar

adj. ordinary, common; skilled; close, intimate; well-known; informal; tame; domestic (Archaic)

n. good friend, acquaintance; member of the household of a pope or bishop; officer of the Inquisition; demon or evil spirit who comes when summoned

In early modern English superstition, a familiar spirit, imp, or familiar (from Middle English familiar, related to family) is an animal-shaped spirit who serves for witchery, a demon or other magician-related subjects. Familiars were imagined to serve their owners as domestic servants, farmhands, spies, and companions, in addition to helping bewitch enemies. These spirits were also said to inspire artists and writers (compare Muse).
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Noun
1. a person attached to the household of a high official (as a pope or bishop) who renders service in return for support
(hypernym) servant, retainer
2. a person who is frequently in the company of another; "drinking companions"; "comrades in arms"
(synonym) companion, comrade, fellow, associate
(hypernym) friend
(hyponym) date, escort
3. a spirit (usually in animal form) that acts as an assistant to a witch or wizard
(synonym) familiar spirit
(hypernym) spirit, disembodied spirit
Adjective
1. well known or easily recognized; "a familiar figure"; "familiar songs"; "familiar guests"
(antonym) unfamiliar
(similar) acquainted(p), acquainted with(p), familiar with(p)
(see-also) known
(attribute) familiarity
2. within normal everyday experience; common and ordinary; not strange; "familiar ordinary objects found in every home"; "a familiar everyday scene"; "a familiar excuse"; "a day like any other filled with familiar duties and experiences"
(antonym) strange, unusual
(similar) common, usual
3. (usually followed by `with') well informed about or knowing thoroughly; "conversant with business trends"; "familiar with the complex machinery"; "he was familiar with those roads"
(synonym) conversant(p), familiar(p)
(similar) informed
4. having mutual interests or affections; of established friendship; "on familiar terms"; "pretending she is on an intimate footing with those she slanders"
(synonym) intimate
(similar) close

adv. familiarly, in a friendly manner, informally, casually, without ceremony

adj. domestic, pertaining to home, pertaining to family, familial, of a family, familiar, related; informal

adj. family, kin; familiar, informal; colloquial; relative

n. relative, kinsman; dependent