1. A case, instance, or situation that is elementary, basic, or underdeveloped; a simple or primitive example of something
The lawyer dismissed it as a rudimentary case that any intern could handle.
O advogado descartou como um caso rudimentar que qualquer estagiário poderia resolver.
2. In medical or scientific contexts, a basic or elementary manifestation of a condition or phenomenon
The patient presented with a rudimentary case of the infection.
O paciente apresentou um caso rudimentar da infecção.