Vital

(a.) Belonging or relating to life, either animal or vegetable; as, vital energies; vital functions; vital actions.

Vital - Other Definitions

(a.) Belonging or relating to life, either animal or vegetable; as, vital energies; vital functions; vital actions.
(a.) Contributing to life; necessary to, or supporting, life; as, vital blood.
(a.) Containing life; living.
(a.) Being the seat of life; being that on which life depends; mortal.
(a.) Very necessary; highly important; essential.
(a.) Capable of living; in a state to live; viable.
(n.) A vital part; one of the vitals.