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
Creative sessions focus on nature and fitness.
—
Condé Nast, Condé Nast Traveler, 5 Apr. 2026
Brooke Burke is joined by a furry friend while filming poolside for her fitness app in Malibu on April 1.
—Escher Walcott, PEOPLE, 4 Apr. 2026
Marta then came on in the 66th minute to help add to the attack as the veteran leader builds up to full match fitness.
—Kyle Foley, The Orlando Sentinel, 4 Apr. 2026
Several people, including a few children and fitness coach Jack LaLanne, have successfully made the swim across the bay over the years, according to BOP.
—Noe Padilla, USA Today, 3 Apr. 2026
See All Example Sentences for fitness
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Condé Nast, Condé Nast Traveler, 5 Apr. 2026
Brooke Burke is joined by a furry friend while filming poolside for her fitness app in Malibu on April 1.
—Escher Walcott, PEOPLE, 4 Apr. 2026
Marta then came on in the 66th minute to help add to the attack as the veteran leader builds up to full match fitness.
—Kyle Foley, The Orlando Sentinel, 4 Apr. 2026
Several people, including a few children and fitness coach Jack LaLanne, have successfully made the swim across the bay over the years, according to BOP.
—Noe Padilla, USA Today, 3 Apr. 2026
See All Example Sentences for fitness
Cite this Entry
“Fitness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fitness. Accessed 6 Apr. 2026.
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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