1. verb /fɪt/
I want to fit the drapes to the design of the room
The speaker should be certain that his subject fits the occasion.
2. adjective /fɪt/
a) in good shape
I think the girl working in the office is fit.
b) suitable
3. noun /fɪt/
a) The degree to which something fits something else.
This shirt is a bad fit.
b) (Advertising) how well a particular commercial execution captures the character or values of a brand.
Since he put on weight, his jeans have been a tight fit.
Wikipedia foundation.