1
: the quality or state of being fit
2
: the capacity of an organism to survive and transmit its genotype to reproductive offspring as compared to competing organisms
also
: the contribution of an allele or genotype to the gene pool of subsequent generations as compared to that of other alleles or genotypes
Examples of fitness in a Sentence
a gymnastics program promoting fitness and agility in school-aged children
I have to question the fitness of wearing a bright red dress to a funeral.
Recent Examples on the Web
While each brand offers a way to gauge how difficult the trip will be — typically a system of numbers and description, like grading a hike in the Dolomites as a level 3, moderate — the fitness level varies depending on the provider.
—
Sal Vaglica, USA Today, 28 July 2025
The onsite Well & Being Spa delivers personalized spa journeys including custom aromatherapy massages and facials, and its state-of-the-art fitness center offers a range of classes from pilates to cross fit.
—Martie Bowser, Forbes.com, 28 July 2025
Programs run from 7 a.m. to 7 p.m. daily and include various traditions of yoga, meditation, Raag therapy, fitness sessions chanting, and music offerings—to name just a few.
—Laura Dannen Redman, Robb Report, 28 July 2025
The City Council in February approved the park master plan, which will include a play area for various age groups, benches, lawn areas, picnic tables and shade structures, as well as meandering paths and fitness equipment.
—Tammy Murga, San Diego Union-Tribune, 27 July 2025
See All Example Sentences for fitness
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Sal Vaglica, USA Today, 28 July 2025
The onsite Well & Being Spa delivers personalized spa journeys including custom aromatherapy massages and facials, and its state-of-the-art fitness center offers a range of classes from pilates to cross fit.
—Martie Bowser, Forbes.com, 28 July 2025
Programs run from 7 a.m. to 7 p.m. daily and include various traditions of yoga, meditation, Raag therapy, fitness sessions chanting, and music offerings—to name just a few.
—Laura Dannen Redman, Robb Report, 28 July 2025
The City Council in February approved the park master plan, which will include a play area for various age groups, benches, lawn areas, picnic tables and shade structures, as well as meandering paths and fitness equipment.
—Tammy Murga, San Diego Union-Tribune, 27 July 2025
See All Example Sentences for fitness
Cite this Entry
“Fitness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fitness. Accessed 7 Aug. 2025.
Copy CitationMedical Definition
fitness
noun
fit·ness
ˈfit-nəs 
: the capacity of an organism to survive and transmit its genotype to reproductively fertile offspring as compared to competing organisms
also
: the contribution of an allele or genotype to the gene pool of subsequent generations as compared to that of other alleles or genotypes
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