Fitness is good physical condition. If you're a fitness nut and you're constantly working out, everybody else at the gym might be eyeing your sculpted muscles with envy and marveling at your stamina and strength.

Fitness can also refer to your being fit, or qualified, for something. If you show up in ragged jeans and a dirty t-shirt to interview for a job in the clean room of a microchip factory, your interviewer might question your fitness for the position. For a ship, fitness is a measure of whether it's seaworthy. In biology, an organism's fitness for a particular environment is its ability to survive and reproduce in those conditions.

Definitions of fitness

n the quality of being suitable

“they had to prove their fitness for the position”
the quality of not being suitable
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making, qualification
an attribute that must be met or complied with and that fits a person for something
habitability, habitableness
suitability for living in or on
the quality or state of being eligible
the quality or state of being ineligible
Type of:
suitability, suitableness
the quality of having the properties that are right for a specific purpose

n the quality of being qualified

Type of:
competence, competency
the quality of being adequately or well qualified physically and intellectually

n good physical condition; being in shape or in condition

physical fitness
softness, unfitness
poor physical condition; being out of shape or out of condition (as from a life of ease and luxury)
a state of fitness and good health
Type of:
condition, shape
the state of (good) health (especially in the phrases `in condition' or `in shape' or `out of condition' or `out of shape')

n fitness to traverse the seas

Type of:
a state or condition free from damage or decay

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