B2necessary 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.Very important or urgentvitally
/-i/adverbC2It's not vitally important that we get extra funding for the project but it would help.Very important or urgent