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
With facilities including five treatment rooms, a meditation temple, rooftop vitality pool, and 24-hour fitness center, the resort’s riverfront spa is a world-class wellness destination on an island renowned as arguably the global leader in wellness tourism.
—
Alexandra Kirkman, Forbes.com, 2 July 2025
Amenities: Restaurant, bars, indoor swimming pool, fitness center, spa, sauna, terrace
Memmo Alfama is the first boutique hotel in the city’s oldest neighborhood, Alfama.
—Monica Mendal, Vogue, 1 July 2025
That puts less strain on your knees and core, and engages your hamstrings more, Andy Fata-Chan, PT, DPT, a physical therapist and fitness coach at Moment Physical Therapy & Performance in New York, tells SELF.
—Sara Coughlin, SELF, 1 July 2025
From the simplicity of an indoor Olympic-sized swimming pool that seems to emerge from the gardens, the spa reveals itself as a swoon-worthy shrine to well-being and fitness.
—Marcia Desanctis, Travel + Leisure, 30 June 2025
See All Example Sentences for fitness
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Alexandra Kirkman, Forbes.com, 2 July 2025
Amenities: Restaurant, bars, indoor swimming pool, fitness center, spa, sauna, terrace
Memmo Alfama is the first boutique hotel in the city’s oldest neighborhood, Alfama.
—Monica Mendal, Vogue, 1 July 2025
That puts less strain on your knees and core, and engages your hamstrings more, Andy Fata-Chan, PT, DPT, a physical therapist and fitness coach at Moment Physical Therapy & Performance in New York, tells SELF.
—Sara Coughlin, SELF, 1 July 2025
From the simplicity of an indoor Olympic-sized swimming pool that seems to emerge from the gardens, the spa reveals itself as a swoon-worthy shrine to well-being and fitness.
—Marcia Desanctis, Travel + Leisure, 30 June 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 15 Jul. 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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