1. The state of being physically strong and healthy
Regular exercise improves your overall fitness.
O exercício regular melhora sua aptidão física geral.
2. The quality of being suitable or appropriate for a particular purpose
The fitness of the candidate for the position was questioned.
A adequação do candidato para o cargo foi questionada.
3. In biology, an organism's ability to survive and reproduce in its environment
Natural selection favors organisms with greater fitness.
A seleção natural favorece organismos com maior aptidão.