n. Anything employed in fitting up permanently: used generally in the plural, in the sense of fixtures, tackle, apparatus, equipment: as, the fittings of an office; gas-fittings.n. In soap-making, the finishing operation for yellow soaps, consisting in removing the lye from the cooled copper, and then bringing its remaining contents again to a boil.Fit or appropriate; suitable; proper.Synonyms See list under fit, adjectiven. Specifically, any small casting or other metal part of a machine or apparatus used to fit together or assemble other parts, as a coupling or elbow used to join lengths of pipe.