1. An unwritten agreement or accepted practice that is understood and followed by members of a group without being explicitly stated or formally documented
It is a silent convention in academia that you cite all sources properly.
É uma convenção tácita no meio acadêmico que você cite adequadamente todas as fontes.
2. An implicit rule or custom established through repeated behavior and mutual understanding rather than formal declaration
There is a silent convention among neighbors to keep their fences maintained.
Existe uma convenção tácita entre vizinhos de manter suas cercas bem conservadas.