'Fitter' definitions:

Definition of 'fitter'

adjective

Improved in health or physical condition [syn: fitter, healthier]

noun

Someone who fits a garment to a particular person

From: GCIDE

Fit \Fit\, a. [Compar. Fitter (f[i^]t"t[~e]r); superl. Fittest (f[i^]t"t[e^]st).] [OE. fit, fyt; cf. E. feat neat, elegant, well made, or icel. fitja to web, knit, OD. vitten to suit, square, Goth. f[=e]tjan to adorn. [root]77.]
1. Adapted to an end, object, or design; suitable by nature or by art; suited by character, qualities, circumstances, education, etc.; qualified; competent; worthy. [1913 Webster]
That which ordinary men are fit for, I am qualified in. --Shak. [1913 Webster]
Fit audience find, though few. --Milton. [1913 Webster]
2. Prepared; ready. [Obs.] [1913 Webster]
So fit to shoot, she singled forth among her foes who first her quarry's strength should feel. --Fairfax. [1913 Webster]
3. Conformed to a standart of duty, properiety, or taste; convenient; meet; becoming; proper. [1913 Webster]
Is it fit to say a king, Thou art wicked? --Job xxxiv. 18.
Syn: Suitable; proper; appropriate; meet; becoming; expedient; congruous; correspondent; apposite; apt; adapted; prepared; qualified; competent; adequate. [1913 Webster]

From: GCIDE

Fitter \Fit"ter\, n.
1. One who fits or makes to fit; esp.: (a) One who tries on, and adjusts, articles of dress. (b) One who fits or adjusts the different parts of machinery to each other. [1913 Webster]
2. A coal broker who conducts the sales between the owner of a coal pit and the shipper. [Eng.] --Simmonds. [1913 Webster]

From: GCIDE

Fitter \Fit"ter\, n. A little piece; a flitter; a flinder. [Obs.] [1913 Webster]
Where's the Frenchman? Alas, he's all fitters. --Beau. & Fl. [1913 Webster]