1. Basic, elementary, or fundamental knowledge of a subject; the most essential or initial level of understanding
He has only rudimentary knowledge of French grammar.
Ele tem apenas conhecimento rudimentar de gramática francesa.
2. Undeveloped or incomplete understanding that forms the foundation for further learning
The students demonstrated rudimentary knowledge of calculus before the advanced course.
Os alunos demonstraram conhecimento rudimentar de cálculo antes do curso avançado.