Having the power to decide; conclusive.(adjective)
Characterized by decision and firmness; resolute.(adjective)
Beyond doubt; unmistakable: a decisive defeat. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "decisive" in a sentence
"SESAY: The Iraqi prime minister has announces what he calls a decisive offensive in the northern city of Mosul."
"Meditating on the deep meaning of the Cross, Sanneh came to what he describes as a decisive conclusion: Suffering is not alien to the nature of God, as his Islamic teachers had insisted, but is at the heart of God's compassion."
"U. S.-led forces there say they are planning what they call decisive operations to reclaim two southern Afghan towns recently captured by Taliban."