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
Sports enthusiasts can keep busy in the fitness center overlooking the ship's bow, or along a promenade deck that doubles as a jogging track.
—
Aaron Saunders, Travel + Leisure, 29 Apr. 2026
Once a week, children at First Academy Preschool in Leesburg wear purple vests equipped with electronic devices that work like fitness bracelets.
—Michael Cuglietta, The Orlando Sentinel, 29 Apr. 2026
As with any other fitness activity, neck training needs to be practiced safely and with attention to an individual’s physical needs and limitations.
—James Ellingworth, Sun Sentinel, 29 Apr. 2026
Plenty of building amenities are also at the ready via a hefty $14,282-per-month maintenance and common charge, including a 24-hour doorman and concierge, a fitness center with a skylit lap pool and spa facilities, screening and game rooms, a wine cellar, and a private restaurant.
—Wendy Bowman, Robb Report, 28 Apr. 2026
See All Example Sentences for fitness
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Aaron Saunders, Travel + Leisure, 29 Apr. 2026
Once a week, children at First Academy Preschool in Leesburg wear purple vests equipped with electronic devices that work like fitness bracelets.
—Michael Cuglietta, The Orlando Sentinel, 29 Apr. 2026
As with any other fitness activity, neck training needs to be practiced safely and with attention to an individual’s physical needs and limitations.
—James Ellingworth, Sun Sentinel, 29 Apr. 2026
Plenty of building amenities are also at the ready via a hefty $14,282-per-month maintenance and common charge, including a 24-hour doorman and concierge, a fitness center with a skylit lap pool and spa facilities, screening and game rooms, a wine cellar, and a private restaurant.
—Wendy Bowman, Robb Report, 28 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 2 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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