Source : Webster's Revised Unabridged Dictionary (1913)

Fitness \Fit"ness\, n.
   The state or quality of being fit; as, the fitness of
   measures or laws; a person's fitness for office.

Source : WordNet®

fitness
     n 1: the condition of being suitable; "they had to prove their
          fitness for the position" [syn: {fittingness}] [ant: {unfitness}]
     2: good physical condition; being in shape or in condition
        [syn: {physical fitness}, {good shape}, {good condition}]
        [ant: {unfitness}]
     3: fitness to traverse the seas [syn: {seaworthiness}]
     4: the quality of being qualified