decisive

a.决定性的

decide for, decide on, decided, decidedly, decider, deciding, deciduous, decilitre, decimal, decimal point, decimal system, decimalization, -isation, decimalize, -ise, decimate, decimation, decimetre, decipher, decipherable, decision, decision-making, decisively, decisiveness, deck, deck-chair, deck-hand, declaim, declamation, declamatory, declaration, declare, declared, declassification, declassify, declension, declination, decline, declining, declivity, declutch, decode,