noun one who fits or makes to fit;.
2. fitter ·noun a little piece; a flitter; a flinder.
3. fitter ·noun one who tries on, and adjusts, articles of dress.
4. fitter ·noun one who fits or adjusts the different parts of machinery to each other.
5. fitter ·noun a coal broker who conducts the sales between the owner of a coal pit and the shipper.