An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function.
Merriam-Webster Online Dictionary
fitting (adjective)of a kind appropriate to the situation - suitable fit
1.
an action or act of one that fits , specifically a trying on of clothes which are in the process of being made or altered
2.
something used in fitting up - accessory
3.
a small often standardized part - an electrical fitting
Merriam-Webster Online Thesaurus
fitting (adjective)meeting the requirements of a purpose or situation
SYNONYMS:
applicable, appropriate, apt, becoming, befitting, felicitous, fitted, fitting, good, happy, meet, pretty, proper, right, suitableRELATED WORDS:
condign, deserved, just, justified; needed, required, requisite; able, capable, competent, cut out, qualified, trained; pitch-perfect; acceptable, adequate, decent, kosher, satisfactory, serviceable, tolerable; correct, decorous, respectable, seemly; balanced, companionate, congruous, consonant, harmonious; rightfulNEAR ANTONYMS:
incapable, incompetent, inept, inexpert, unqualified, unskilled, unskillful, untrained; inadequate, intolerable, unacceptable, unsatisfactory; graceless, incorrect, indecorous; incompatible, uncongenialattachment, connector, adapter, coupling, joint