fitness
UK: ˈfɪtnəs | US: ˈfɪtnəs
n. the condition of being physically fit and healthy
n. the quality of being suitable or appropriate for a purpose
n. (biology) the ability of an organism to survive and reproduce in its environment
The word "fitness" originates from the Middle English term "fit," meaning "suited" or "ready," which itself derives from Old English "fitt" (a struggle or conflict). Over time, "fit" evolved to describe suitability or readiness, and by the 16th century, it also took on meanings related to physical health. The suffix "-ness," of Old English origin, was added to form a noun denoting the state or quality of being fit. In biology, "fitness" was later adopted by Charles Darwin's theory of natural selection to describe an organism's reproductive success.
Regular exercise improves physical fitness and mental well-being.
The fitness of this candidate for the job is undeniable.
Evolutionary fitness determines which traits are passed to future generations.
She joined a gym to work on her fitness goals.
The design’s fitness for its intended purpose was thoroughly tested.