What is Fit?

Fit definition and meaning on Dictionary terms:
adjective, fitA.ter, fitA.test.
adapted or suited; appropriate: This water isn’t fit for drinking. A long-necked giraffe is fit for browsing treetops.
proper or becoming: fit behavior.

qualified or competent, as for an office or function: a fit candidate.
prepared or ready: crops fit for gathering.
in good physical condition; in good health: He’s fit for the race.
Biology. being adapted to the prevailing conditions and producing offspring that survive to reproductive age. contributing genetic information to the gene pool of the next generation. (of a population) maintaining or increasing the group’s numbers in the environment.

verb (used with object), fitA.ted or fit, fitA.ting.
to be adapted to or suitable for (a purpose, object, occasion, etc.).
to be proper or becoming for.

to be of the right size or shape for: The dress fitted her perfectly.
to adjust or make conform: to fit a ring to the finger.
to make qualified or competent: qualities that fit one for leadership.
to prepare: This school fits students for college.
to put with precise placement or adjustment: He fitted the picture into the frame.
to provide; furnish; equip: to fit a door with a new handle.

verb (used without object), fitA.ted or fit, fitA.ting.
to be suitable or proper.
to be of the right size or shape, as a garment for the wearer or any object or part for a thing to which it is applied: The shoes fit.

the manner in which a thing fits: The fit was perfect.
something that fits: The coat is a poor fit.

the process of fitting.

Verb Phrases
fit out/up, to furnish with supplies, equipment, clothing, furniture, or other requisites; supply; equip: to fit out an expedition.