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
Vasa Fitness, a chain with dual headquarters in Utah and Colorado, submitted a plan in August to remodel the building and turn it into a fitness center.
—
Angela Palermo, Idaho Statesman, 9 Jan. 2026
These search terms were then grouped into seven core categories, comprising health and fitness, financial goals, career, breaking bad habits, social and relationships, and hobbies.
—Abigail Wilt, Southern Living, 9 Jan. 2026
At a time when colleges and universities have spent considerable money on new athletic stadiums, student fitness centers, multi-level food courts, and million-dollar salaries for football and basketball coaches, earmarking money for high quality campus security continues to be problematic.
—Rick Pozniak, Boston Herald, 9 Jan. 2026
The spa’s second floor is home to an expansive fitness center (personal training and group fitness classes available), and there’s a tennis court and outdoor yoga deck just outside.
—Condé Nast, Condé Nast Traveler, 9 Jan. 2026
See All Example Sentences for fitness
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Angela Palermo, Idaho Statesman, 9 Jan. 2026
These search terms were then grouped into seven core categories, comprising health and fitness, financial goals, career, breaking bad habits, social and relationships, and hobbies.
—Abigail Wilt, Southern Living, 9 Jan. 2026
At a time when colleges and universities have spent considerable money on new athletic stadiums, student fitness centers, multi-level food courts, and million-dollar salaries for football and basketball coaches, earmarking money for high quality campus security continues to be problematic.
—Rick Pozniak, Boston Herald, 9 Jan. 2026
The spa’s second floor is home to an expansive fitness center (personal training and group fitness classes available), and there’s a tennis court and outdoor yoga deck just outside.
—Condé Nast, Condé Nast Traveler, 9 Jan. 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 10 Jan. 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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