Etymology
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fitness (n.)

1570s, "state or quality of being suitable," from fit (adj.) + -ness. Meaning "state of being physically fit" is from 1935.

updated on November 12, 2014

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Definitions of fitness from WordNet

fitness (n.)
the quality of being suitable;
they had to prove their fitness for the position
Synonyms: fittingness
fitness (n.)
good physical condition; being in shape or in condition;
Synonyms: physical fitness
fitness (n.)
the quality of being qualified;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.