(1):

(a.) Very necessary; highly important; essential.

(2):

(a.) Capable of living; in a state to live; viable.

(3):

(n.) A vital part; one of the vitals.

(4):

(a.) Being the seat of life; being that on which life depends; mortal.

(5):

(a.) Containing life; living.

(6):

(a.) Contributing to life; necessary to, or supporting, life; as, vital blood.

(7):

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