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

• health
• healthiness
• heartiness
• robustness
• sap
• soundness
• verdure
• wellness
• wholeness
• wholesomeness

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

Stay consistent with your training to see improvements in strength, endurance, and overall functional fitness. —Kelly Burch Published, Verywell Health, 7 Feb. 2025

The brand offers elevated and sophisticated everyday pieces influenced by golf, racquet sports and general fitness. —Jean E. Palmieri, WWD, 7 Feb. 2025

The home’s lower level is a full-sized finished basement with 10-foot-high ceilings and custom lighting, along with a bedroom, fitness room, bar/kitchen, game room and storage. —Bob Goldsborough, Chicago Tribune, 7 Feb. 2025

Community spaces will include rooms with a kitchenette for gatherings, a computer and library room, a craft room, a fitness room, an outdoor grill area with picnic tables and a dog park. —Marina Johnson, The Courier-Journal, 7 Feb. 2025

Word History

First Known Use

1580, in the meaning defined at sense 1

Phrases Containing fitness

• physical fitness

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