Learner's definition of FAMILIAR
[more familiar; most familiar]
1 a : frequently seen, heard, or experienced
— often + to b — used to say that something is easy for you to recognize because you have seen, heard, or experienced it many times in the past c : possibly known but not clearly remembered
a familiar joke/sight
The essay covers familiar ground/territory.
It's a sad but (all too) familiar story.
She has become a familiar figure in the world of politics.
2 a : relaxed and informal b : appropriate for use with people you know well c : too friendly — often + with
: having some knowledge about (something)