fitness

noun

fit·​ness ˈfit-nəs 

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

• health
• wellness
• strength

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

Wodapalooza has attracted thousands of visitors and is part of the city’s plan this year to rebrand Miami Beach in March as a fitness destination rather than a party hotspot. —Devoun Cetoute, Miami Herald, 15 Mar. 2026

The spa itself sprawls 64,000 square feet and has a cluster of treatment pavilions, fitness centers, and outdoor pools where hydrotherapy sessions are performed (my partner turned to jelly after a particularly effective water shiatsu session). —Condé Nast, Condé Nast Traveler, 14 Mar. 2026

Amenities include fitness facilities, a lobby, lounge and two-story parking garage. —Susannah Bryan, Sun Sentinel, 14 Mar. 2026

Wildlife facilities generally evaluate disease status, parasitic load, behavioral fitness and genetic background when determining placement for animals that arrive under unusual circumstances. —Hanna Wickes, Kansas City Star, 13 Mar. 2026

Word History

First Known Use

1574, in the meaning defined at sense 1

Phrases Containing fitness

• physical fitness

Rhymes for fitness

• witness
• eyewitness
• unfitness

Medical 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