very important for the final result of a particular situation
able to decide sth quickly and with confidence
"cast the decisive vote"
"two factors had a decisive influence"
"had a decisive lead in the polls"
"an able and decisive young woman"
"we needed decisive leadership"
"she gave him a decisive answer"
"a critical point in the campaign"
"the critical test"
The decisive argument his friends had used to convince him.
出自： A. Koestler
Midway..one of the decisive battles of the war.
出自： D. Fraser