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The definition of vital

8 Definitions of: vital

    1. adjective, essential to maintain life
    2. adjective, forceful, energetic, or lively
    3. adjective, of, relating to, having, or displaying life
    4. adjective, indispensable or essential
    5. adjective, of great importance; decisive
    6. adjective, influencing the course of life, esp negatively
    7. noun, a) the bodily organs, such as the brain, liver, heart, lungs, etc, that are necessary to maintain life b) the organs of reproduction, esp the male genitals
    8. noun, the essential elements of anything
    9. Show me some examples of this word: vital
    10. Show me the etymology of the word: vital

From Collins