noun

fitness

health, physical condition, suitability

I want to improve my fitness.

I want to improve my fitness.

He questioned her fitness for the role.

He questioned her fitness for the role.

fitness ((for sth.)) the condition of being physically strong and healthy I want to improve my fitness.

fitness ((for sth. / to-inf)) the quality of being suitable for a role He questioned her fitness for the role.

Synonyms: health, well-being, suitability, aptitude

From the adjective 'fit' + the noun-forming suffix '-ness'. It means 'the state of being fit'.

The suffix '-ness' indicates a state or condition. Therefore, 'fitness' is the state of being 'fit'.

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