say it: di-SAHY-siv
decisive is an adjective meaning "determining or having the power to determine an outcome". It carries 4 recorded senses.
determining or having the power to determine an outcome
“cast the decisive vote”
“two factors had a decisive influence”
characterized by decision and firmness
“an able and decisive young woman”
“we needed decisive leadership”
“she gave him a decisive answer”
Definitions, synonyms and semantic relations for decisive come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.