fitter Syllabification: (fit·ter)Pronunciation: /ˈfitər/Translate fitter | into German | into Italian | into Spanish Definition of fitter noun 1a person who puts together or installs machinery, engine parts, or other equipment:a pipe fitter 2a person who supervises the cutting, fitting, or alteration of garments or shoes. fitter in other Oxford dictionaries Definition of fitter in the British & World English dictionary