Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The state or condition of being fit; suitability or appropriateness.
  • noun Good health, especially good physical condition resulting from exercise and proper nutrition.
  • noun Biology The extent to which an organism is able to produce offspring in a particular environment.

from The Century Dictionary.

  • noun The state or quality of being fit or suitable; suitableness; adaptedness or adaptability of one thing to another; hence, congruity; befittingness; meetness: as, the fitness of things; the fitness of a thing for the purpose intended.
  • noun The state of being fitted or qualified; requisite capacity; qualification: as, he lacks fitness for the place.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The state or quality of being fit

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The condition of being fit, suitable or appropriate.
  • noun The cultivation of an attractive and/or healthy physique.
  • noun UK, slang The condition of being attractive, fanciable or beautiful.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quality of being qualified
  • noun the quality of being suitable
  • noun good physical condition; being in shape or in condition
  • noun fitness to traverse the seas

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

fit +‎ -ness.

Examples

Comments

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  • "Knowing the perfect fitness and equanimity of things, while they discuss I am silent, and go bathe and admire myself." Whitman, Song of Myself, 3

    January 4, 2008