1. A topic or issue that is no longer open for discussion, debate, or reconsideration; a settled matter
The decision is a closed matter and will not be revisited.
A decisão é um assunto encerrado e não será revisto.
2. In legal or administrative contexts, a case or file that has been officially concluded and requires no further action
Once the investigation concluded, the case became a closed matter.
Após o término da investigação, o caso tornou-se um assunto encerrado.