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
For a wellness moment, guests can melt away stress at the luxury spa at sister property Condado Vanderbilt next door, or break a sweat at the lagoon-view fitness center.
—
Condé Nast, Condé Nast Traveler, 21 May 2026
Jamie Gittens, too, is a straightforward winger and has had a difficult first season at Stamford Bridge, struggling for a place due to form and often fitness.
—Cerys Jones, New York Times, 21 May 2026
The Office alum has spoken publicly in recent years about focusing on health and fitness rather than appearance.
—Angelique Brenes, PEOPLE, 20 May 2026
As an example, Google Antigravity could create an interactive fitness tracker for a user looking to establish a new health and wellness routine.
—Greta Cross, USA Today, 20 May 2026
See All Example Sentences for fitness
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Condé Nast, Condé Nast Traveler, 21 May 2026
Jamie Gittens, too, is a straightforward winger and has had a difficult first season at Stamford Bridge, struggling for a place due to form and often fitness.
—Cerys Jones, New York Times, 21 May 2026
The Office alum has spoken publicly in recent years about focusing on health and fitness rather than appearance.
—Angelique Brenes, PEOPLE, 20 May 2026
As an example, Google Antigravity could create an interactive fitness tracker for a user looking to establish a new health and wellness routine.
—Greta Cross, USA Today, 20 May 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 23 May. 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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