vital (Adjective) — Urgently needed; absolutely necessary. ex. "vital for a healthy society" ex. "of vital interest"
vital (Adjective) — Performing an essential function in the living body. ex. "blood and other vital fluids" ex. "the loss of vital heat in shock" ex. "a vital spot" ex. "vital organs"
vital (Adjective) — Full of spirit. ex. "a vital and charismatic leader"
vital (Adjective) — Manifesting or characteristic of life. ex. "a vital, living organism" ex. "vital signs"