fitness /ˈfɪt.nəs/ noun4 •The condition of being fit, suitable or appropriate.That's chiefly why they're coming; I want you to meet them here and then tell me frankly what you think of their fitness for whatever we decide on doing. — 1934 •The cultivation of an attractive and/or healthy physique. •An organism's or species' degree of success in finding a mate and producing offspring. •(UK, slang) The condition of being attractive, fanciable or beautiful. formsfitnesses