'Importantly' definitions:

Definition of 'importantly'

From: WordNet
adverb
In an important way or to an important degree; "more importantly, Weber held that the manifold meaning attached to the event by the social scientist could alter his definition of the concrete event itself" [syn: importantly, significantly]
adverb
In an important way; "for centuries jellies have figured importantly among English desserts, particularly upon festive occasion"

Definition of 'Importantly'

From: GCIDE
  • Importantly \Im*por"tant*ly\, adv. In an important manner. [1913 Webster]