1. in a way that is extremely important or necessary
2. in a way that relates to life or living processes
Usage: formal; medical

Examples

• It is vitally important that we arrive on time.
• The new funding is vitally needed for the school’s programs.
• Clean water is vitally necessary for human survival.
• The patient’s organs are functioning vitally.
• This information is vitally relevant to our decision.
• The ecosystem depends vitally on these keystone species.