Definition of importance noun from the Oxford Advanced American Dictionary

  

importance

 noun
noun
NAmE//ɪmˈpɔrtns//
 
[uncountable]
 
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 the quality of being important She stressed the importance of careful preparation. It's a matter of the greatest importance to me. They attach great importance to the project the relative importance of the two ideas State your reasons in order of importance. He was very aware of his own importance .
See the Oxford Advanced Learner's Dictionary entry: importance