Definition of importantly
1
—used to say that what follows in a sentence is important … much more importantly he stands a chance of having his publication barred …— H. L. Mencken
2a
: in an important way
… contributed importantly to the language of the field.— Ernst Mayr … the real story is importantly different from the one surmised.— Alexander Woollcott
b
: in a self-important or pompous manner
… he talked importantly of the managerial position he had reached, after a lifetime of devotion and toil …— William Trevor
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Merriam-Webster unabridged
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Time Traveler for importantly
The first known use of importantly was in 1611
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