What is the meaning of familiar?

noun

• A person attached to the household of a high official (as a pope or bishop) who renders service in return for support.
• A friend who is frequently in the company of another.
  • usage: "drinking companions"; "comrades in arms"
  • synonyms: companion, comrade, fellow, associate
• A spirit (usually in animal form) that acts as an assistant to a witch or wizard.
  • synonyms: familiar spirit

adjective

• Well known or easily recognized.
  • usage: "a familiar figure"; "familiar songs"; "familiar guests"
• Within normal everyday experience; common and ordinary; not strange.
  • usage: "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"
• Usually followed by `with'. ( well informed about or knowing thoroughly)
  • usage: "conversant with business trends"; "familiar with the complex machinery"; "he was familiar with those roads"
  • synonyms: conversant
• Having mutual interests or affections; of established friendship.
  • usage: "on familiar terms"; "pretending she is on an intimate footing with those she slanders"
  • synonyms: intimate