Definitions:
of a suitable quality, standard, or type to meet the required purpose

in good health, especially because of regular physical exercise

be of the right shape and size for

install or fix (something) into place

be compatible or in agreement with; match

the particular way in which something, especially a garment or component, fits

a sudden attack of convulsions and/or loss of consciousness, typical of epilepsy and some other medical conditions

a sudden short period of uncontrollable coughing, laughter, etc.

have an epileptic fit

a section of a poem.