FIT

noun

1. The degree to which something fits.
2. Conformity of elements one to another.
3. The part of an object upon which anything fits tightly.

verb

1. To be suitable for.
2. To conform to in size and shape.
3. To be of the right size and shape

adjective

1. Suitable, proper.
2. Adapted to a purpose or environment.
3. In good shape; physically well.