Used to mark a statement as having importance.(adverb)
In an important manner.(adverb)
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Use "importantly" in a sentence
"More importantly, is it reasonable to expect Iran to comply?"
"We have a President who listens to his advisers, and more importantly, is a pragmatist whose sole concerns are solutions to improving the economy and creating the climate for more jobs."
"And, more importantly, is it more pleasurable when you're in the bathtub?"