Read the dictionary definition of familiar. All definitions for this word.
1. a spirit (usually in animal form) that acts as an assistant to a witch or wizard
2. a friend who is frequently in the company of another
1. drinking companions
2. comrades in arms
3. a person attached to the household of a high official (as a pope or bishop) who renders service in return for support
4. having mutual interests or affections; of established friendship
1. on familiar terms
2. pretending she is on an intimate footing with those she slanders
5. well known or easily recognized
1. a familiar figure
2. familiar songs
3. familiar guests
6. within normal everyday experience; common and ordinary; not strange
1. familiar ordinary objects found in every home
2. a familiar everyday scene
3. a familiar excuse
4. a day like any other filled with familiar duties and experiences
7. (usually followed by `with') well informed about or knowing thoroughly
1. conversant with business trends
2. familiar with the complex machinery
3. he was familiar with those roads