Real Dictionary

-fitting
combining form: -fitting combines with adjectives or adverbs such as ' close', ' loose', or 'tightly' to show that something is the size indicated in relation to the thing it is on, in, or next to.

fitting
adjective: Something that is fitting is right or suitable.
countable noun: A fitting is one of the smaller parts on the outside of a piece of equipment or furniture, for example a handle or a tap.
plural noun: Fittings are things such as ovens or heaters, that are fitted inside a building, but can be removed if necessary.

fitting in American English
an adjustment or trying on of clothes, etc. for fit
suitable; proper; appropriate
adjective: suitable or appropriate; proper or becoming
noun: the act of a person or thing that fits

fitting in British English
adjective: appropriate or proper; suitable
noun: an accessory or part

fitting in Mechanical Engineering
noun: A fitting is a part, especially one of a standard size or shape, that goes with a larger system.