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English definition of “vital”

vital

adjective uk   /ˈvaɪ.təl/ us    /-t̬əl/

vital adjective (IMPORTANT)

B2 necessary for the success or continued existence of something; extremely important: A strong opposition is vital to a healthy democracy. She had found out some information of vital importance. The kidney plays a vital role/part in the removal of waste products from the blood. [+ that] It's absolutely vital that you do exactly as I say. [+ to infinitive] It is vital to get medical supplies to the area as soon as possible.

vital adjective (LIVELY)

formal approving energetic: He had never felt so vital and full of life. formal relating to life
vitally
adverb uk   /-i/ us  
C2 It's not vitally important that we get extra funding for the project, but it would help.
(Definition of vital from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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