An attendant spirit, often in animal or demon form.

“The witch’s familiar was a black cat.”

A member of one's family or household.

A member of a pope's or bishop's household.

Known to one, or generally known; commonplace.

“there’s a familiar face; that tune sounds familiar”

Acquainted.

“I'm quite familiar with this system; she's not familiar with manual gears”

Intimate or friendly.

“we are not on familiar terms; our neighbour is not familiar”