fitness
Americannoun
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capability of the body of distributing inhaled oxygen to muscle tissue during increased physical effort.
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Also called Darwinian fitness. Biology.
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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.
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the ability of a population to maintain or increase its numbers in succeeding generations.
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noun
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the state of being fit
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biology
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the degree of adaptation of an organism to its environment, determined by its genetic constitution
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the ability of an organism to produce viable offspring capable of surviving to the next generation
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Other Word Forms
Noun Inflected Forms
Etymology
Origin of fitness
Explanation
Fitness is good physical condition. If you're a fitness nut and you're constantly working out, everybody else at the gym might be eyeing your sculpted muscles with envy and marveling at your stamina and strength. Fitness can also refer to your being fit, or qualified, for something. If you show up in ragged jeans and a dirty t-shirt to interview for a job in the clean room of a microchip factory, your interviewer might question your fitness for the position. For a ship, fitness is a measure of whether it's seaworthy. In biology, an organism's fitness for a particular environment is its ability to survive and reproduce in those conditions.
Vocabulary lists containing fitness
Word Generation Science - Life Science
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Physical Education - Introductory
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
They are recommended by longevity clinics, fitness influencers and telehealth companies.
From MarketWatch ● Jul. 24, 2026
China’s rock-climbing boom is part of a larger fitness craze that has taken over the country.
From The Wall Street Journal ● Jul. 24, 2026
Holliday spends her volunteer time socializing over coffee and the newspaper, helping residents run errands, leading fitness classes on Saturday mornings and organizing game nights.
From MarketWatch ● Jul. 24, 2026
Bailey started his business in his hometown of Grimsby but he and his team now deliver fitness sessions acoss the country, including at Lindley Park.
From BBC ● Jul. 22, 2026
“A new fitness program is moving in,” Ali went on.
From "The Stars Beneath Our Feet" by David Barclay Moore
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
