1. A process of choosing or picking something slowly and progressively over time, rather than all at once
The gradual selection of materials for the project took several months.
A seleção gradual de materiais para o projeto levou vários meses.
2. In biology, the process by which organisms with advantageous traits are progressively chosen by natural forces, leading to evolutionary change
Gradual selection is a key mechanism in the theory of evolution.
A seleção gradual é um mecanismo-chave na teoria da evolução.