capability of the body of distributing inhaled oxygen to muscle tissue during increased physical effort.
Also called Darwinian fitness. Biology.
the genetic contribution of an individual to the next generation's gene pool relative to the average for the population, usually measured by the number of offspring or close kin that survive to reproductive age.
the ability of a population to maintain or increase its numbers in succeeding generations.

1570–80; fit1 + -ness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fitness (ˈfɪtnɪs)
1.  the state of being fit
2.  biology
 a.  the degree of adaptation of an organism to its environment, determined by its genetic constitution
 b.  the ability of an organism to produce viable offspring capable of surviving to the next generation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, from fit (adj.) + -ness.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fitness fit·ness (fĭt'nĭs)

  1. The state or condition of being physically sound and healthy, especially as the result of exercise and proper nutrition.

  2. A state of general mental and physical well-being.

  3. The state of being suitably adapted to an environment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Advise undergraduate students in exercise sport science and fitness and
  wellness management.
There are a lot of brain training games that you can play to improve the
  fitness of your brain.
Six tennis courts and a fitness center overlook the cove.
She had gone about her business in the college fitness center essentially
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