fitness

noun

fit·​ness ˈfit-nəs How to pronounce fitness (audio)
Synonyms of fitnessnext
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 of fitness

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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.
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Among the amenities at the hotel today, according to its website, are conference facilities, indoor pool, sauna, solarium, fitness center, spa, massage room, hot tub, library and bicycle rental. — Kelly McGreal, FOXNews.com, 11 Oct. 2026 And a high degree of social fitness contributes to a longer, healthier and more fulfilled life, according to an ongoing 88-year-old Harvard University happiness study. — Renée Onque, CNBC, 10 Oct. 2026 Time has run out for Amazon Prime's Big Deal Days, but luckily, there are still plenty of discounts on smartwatches and fitness trackers. — Cierra Cowan, PC Magazine, 9 Oct. 2026 According to city records first reported by the Santa Monica Daily Press, the Victorian will be converted into a members club including a pool, spa, fitness center and coffee bistro. — Ella Chakarian, Los Angeles Times, 8 Oct. 2026 See All Example Sentences for fitness

Word History

First Known Use

1574, in the meaning defined at sense 1

Time Traveler
The first known use of fitness was in 1574

Phrases Containing fitness

Rhymes for fitness

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Browse Nearby Words

fitment
fitness
fit of laughter
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Cite this Entry

“Fitness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fitness. Accessed 14 Oct. 2026.

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Medical Definition

fitness

noun
fit·​ness ˈfit-nəs How to pronounce fitness (audio)
: 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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