fit·ness

[fit-nis]
noun
2.
capability of the body of distributing inhaled oxygen to muscle tissue during increased physical effort.
3.
Also called Darwinian fitness. Biology.
a.
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.
b.
the ability of a population to maintain or increase its numbers in succeeding generations.

Origin:
1570–80; fit1 + -ness

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
fitness (ˈfɪtnɪs) [Click for IPA pronunciation guide]
 
n
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
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Fitness is always a great word to know.
So is doohickey. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

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

fitness fit·ness (fĭt'nĭs)
n.

  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
She obsessed over fitness and appearance, was probably anorexic, and was never
  happy in her marriage.
Six tennis courts and a fitness center overlook the cove.
For a user, it means, a better overall picture of your fitness and medical
  information.
But here it seems to mean personal and spiritual growth, and perhaps physical
  fitness.
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