In a conclusive manner; in a manner to end deliberation, controversy, doubt, or contest.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. with firmness
ad. with finality; conclusively
ad. in an indisputable degree
Word Usage
"With the development of new trade routes around the southern tip of Africa by the Portuguese and the discovery of the New World by Columbus, the center of the Western world moved decisively from the Mediterranean to the Atlantic."