1. A topic or issue of critical importance that is essential to discuss, resolve, or understand
Healthcare reform is a vital subject in the current political debate.
A reforma da saúde é um assunto vital no debate político atual.
2. A fundamental topic of study or concern that directly affects survival, well-being, or success
Climate change has become a vital subject for all nations.
A mudança climática tornou-se um assunto vital para todas as nações.