Definition of vital

• 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.