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
Synonyms
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
Rucking falls into that a similar category of fitness because a version of it is something that many of us are doing every day - often without realizing.
—
Daryl Austin, USA TODAY, 29 Jan. 2025
Cardiovascular fitness: Cardiovascular exercises are vital for maintaining heart health, improving circulation, increasing caloric burn and boosting overall endurance.
—Dana Santas, CNN, 29 Jan. 2025
Members of the community can meet exhibitors from local businesses in areas such as fitness, finance, estate planning, health, insurance, real estate, senior services and travel.
—Ut Community Press, San Diego Union-Tribune, 28 Jan. 2025
Separately from the Scharf initiative, Equinox is planning to have group fitness rally classes, where participants will make donations to join the class and those donations will also benefit the LAFD’s Foundation.
—Rosemary Feitelberg, WWD, 26 Jan. 2025
See all Example Sentences for fitness 
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Daryl Austin, USA TODAY, 29 Jan. 2025
Cardiovascular fitness: Cardiovascular exercises are vital for maintaining heart health, improving circulation, increasing caloric burn and boosting overall endurance.
—Dana Santas, CNN, 29 Jan. 2025
Members of the community can meet exhibitors from local businesses in areas such as fitness, finance, estate planning, health, insurance, real estate, senior services and travel.
—Ut Community Press, San Diego Union-Tribune, 28 Jan. 2025
Separately from the Scharf initiative, Equinox is planning to have group fitness rally classes, where participants will make donations to join the class and those donations will also benefit the LAFD’s Foundation.
—Rosemary Feitelberg, WWD, 26 Jan. 2025
See all Example Sentences for fitness
Dictionary Entries Near fitness
Cite this Entry
“Fitness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fitness. Accessed 2 Feb. 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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