a person or thing that fits.
a person who fits garments.
a worker who fits together or adjusts the parts of machinery.
a person who supplies and fixes fittings or fixtures.
a person who furnishes or equips with whatever is necessary for some purpose.

Origin of fitter

First recorded in 1650–60; fit1 + -er1



adjective, fit·ter, fit·test.

adapted or suited; appropriate: This water isn't fit for drinking. A long-necked giraffe is fit for browsing treetops.
proper or becoming: fit behavior.
qualified or competent, as for an office or function: a fit candidate.
prepared or ready: crops fit for gathering.
in good physical condition; in good health: He's fit for the race.
  1. being adapted to the prevailing conditions and producing offspring that survive to reproductive age.
  2. contributing genetic information to the gene pool of the next generation.
  3. (of a population) maintaining or increasing the group's numbers in the environment.

verb (used with object), fit·ted or fit, fit·ting.

to be adapted to or suitable for (a purpose, object, occasion, etc.).
to be proper or becoming for.
to be of the right size or shape for: The dress fitted her perfectly.
to adjust or make conform: to fit a ring to the finger.
to make qualified or competent: qualities that fit one for leadership.
to prepare: This school fits students for college.
to put with precise placement or adjustment: He fitted the picture into the frame.
to provide; furnish; equip: to fit a door with a new handle.

verb (used without object), fit·ted or fit, fit·ting.

to be suitable or proper.
to be of the right size or shape, as a garment for the wearer or any object or part for a thing to which it is applied: The shoes fit.


the manner in which a thing fits: The fit was perfect.
something that fits: The coat is a poor fit.
the process of fitting.

Verb Phrases

fit out/up, to furnish with supplies, equipment, clothing, furniture, or other requisites; supply; equip: to fit out an expedition.

Origin of fit

1325–75; Middle English fitten; akin to Middle Dutch vitten to befit
Related formsfit·ta·ble, adjectiveun·fit·ta·ble, adjective

Synonyms for fit

Usage note

Both fit and fitted are standard as past tense and past participle of fit1 : The new door fit (or fitted ) the old frame perfectly. The suit had fitted (or fit ) well last year. Fitted is somewhat more common than fit in the sense “to adjust, make conform”: The tailor fitted the suit with a minimum of fuss. In the passive voice, fitted is the more common past participle: The door was fitted with a new handle. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fitter

Contemporary Examples of fitter

  • The party's leader, Naftali Bennett, is an American-born centi-millionaire who resembles a younger, fitter Sheldon Adelson.

    The Daily Beast logo
    The Election Obama Will Lose

    Robert Shrum

    January 17, 2013

  • The 46-year-old Chernoff looks like a fitter and younger Sam Shepard.

    The Daily Beast logo
    Can This Man Save Jacko's Doctor?

    Gerald Posner

    February 4, 2010

  • Just get out and start walking, increasing your pace and distance as you get fitter.

    The Daily Beast logo
    Do Your Genes Make You Fat?

    Arthur Agatston, M.D.

    January 4, 2010

Historical Examples of fitter

  • The result is this, that I am fitter for this world than you; you for the next than me:—that is the difference.

    Clarissa, Volume 1 (of 9)

    Samuel Richardson

  • Then he bethought him that there was one beside him who was fitter to judge on such a matter.

    The White Company

    Arthur Conan Doyle

  • And Beauchene, having recognized the wife of Moineaud, the fitter, bade her come in.


    Emile Zola

  • The more keen the struggle, the fewer could survive and the fitter they must be to survive at all.

    The Meaning of Evolution

    Samuel Christian Schmucker

  • "I should have thought his tormentors were fitter occupants of his cell," said Ralph.

British Dictionary definitions for fitter



a person who fits a garment, esp when it is made for a particular person
a person who is skilled in the assembly and adjustment of machinery, esp of a specified sortan electrical fitter
a person who supplies something for an expedition, activity, etc



verb fits, fitting or fitted or US fit

to be appropriate or suitable for (a situation, etc)
to be of the correct size or shape for (a connection, container, etc)
(tr) to adjust in order to render appropriatethey had to fit the idea to their philosophy
(tr) to supply with that which is needed
(tr) to try clothes on (someone) in order to make adjustments if necessary
(tr) to make competent or readythe experience helped to fit him for the task
(tr) to locate with care
(intr) to correspond with the facts or circumstances

adjective fitter or fittest

suitable to a purpose or design; appropriate
having the right qualifications; qualifying
in good health
worthy or deservinga book fit to be read
(foll by an infinitive) in such an extreme condition that a specified consequence is likelyshe was fit to scream; you look fit to drop
mainly British informal (of a person) sexually attractive


the manner in which something fits
the act or process of fitting
statistics the correspondence between observed and predicted characteristics of a distribution or modelSee goodness of fit
See also fit in, fit out, fit up
Derived Formsfittable, adjective

Word Origin for fit

C14: probably from Middle Dutch vitten; related to Old Norse fitja to knit




pathol a sudden attack or convulsion, such as an epileptic seizure
a sudden spell of emotiona fit of anger
an impulsive period of activity or lack of activity; mooda fit of laziness
give a person a fit to surprise a person in an outrageous manner
have a fit or throw a fit informal to become very angry or excited
in fits and starts or by fits and starts in spasmodic spells; irregularly

verb fits, fitting or fitted

(intr) informal to have a sudden attack or convulsion, such as an epileptic seizure

Word Origin for fit

Old English fitt conflict; see fit ³




archaic a story or song or a section of a story or song

Word Origin for fit

Old English fitt; related to Old Norse fit hem, Old High German fizza yarn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fitter

1650s, agent noun from fit (v.).



"be suitable," probably from early 15c.; "to be the right shape," 1580s, from fit (adj.). Related: Fitted; fitting. Fitted sheets is attested from 1963.



part of a poem, Old English fitt, of unknown origin.



1823, "the fitting of one thing to another," later (1831) "the way something fits." Originally "an adversary of equal power" (mid-13c.), obscure, possibly from Old English fitt "a conflict, a struggle" (see fit (n.2)).



"paroxysm, sudden attack" (as of anger), 1540s, probably via Middle English sense of "painful, exciting experience" (early 14c.), from Old English fitt "conflict, struggle," of uncertain origin, with no clear cognates outside English. Perhaps ultimately cognate with fit (n.1) on notion of "to meet." Phrase by fits and starts first attested 1610s.



"suited to the circumstances, proper," mid-15c., of unknown origin, perhaps from Middle English noun fit "an adversary of equal power" (mid-13c.), which is perhaps connected to fit (n.1). Related: Fitter; fittest. Survival of the fittest (1867) coined by H. Spencer.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with fitter


In addition to the idioms beginning with fit

  • fit as a fiddle
  • fit in
  • fit like a glove
  • fit out
  • fits and starts, by
  • fit to be tied
  • fit to kill

also see:

  • give someone fits
  • have a fit
  • if the shoe fits
  • see fit to
  • survival of the fittest
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.