Learner's definition of IMPORTANCE
: the quality or state of being important : value or significance
The teacher lectured the students on the importance of mutual respect.
a medical discovery of great/major importance [=a very important medical discovery]
He exaggerated the importance of his role in the rescue mission.
The negotiations have taken on added importance in the wake of the bomb attack.
a matter of little/minor importance
Nothing of importance [=nothing important] was decided.