"determinative" in the noun sense
1. determiner, determinative
one of a limited class of noun modifiers that determine the referents of noun phrases
2. determinant, determiner, determinative, determining factor, causal factor
a determining or causal element or factor
"education is an important determinant of one's outlook on life"
"determinative" in the adjective sense
1. deciding, determinant, determinative, determining
having the power or quality of deciding
"the crucial experiment"
"cast the deciding vote"
"the determinative (or determinant) battle"
Source: WordNet® (An amazing lexical database of English)
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