determinative

de·ter·mi·na·tive  (d-tûrm-ntv, -n-)

adj.

Tending, able, or serving to determine. See Synonyms at decisive.

n.

A determining factor.

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de·termi·native·ly adv.

de·termi·native·ness n.

Thesaurus

Noun	1.	determinative - one of a limited class of noun modifiers that determine the referents of noun phrases determiner closed-class word, function word - a word that is uninflected and serves a grammatical function but has little identifiable meaning article - (grammar) a determiner that may indicate the specificity of reference of a noun phrase
	2.	determinative - a determining or causal element or factor; "education is an important determinant of one's outlook on life" causal factor, determinant, determining factor, determiner cognitive factor - something immaterial (as a circumstance or influence) that contributes to producing a result decisive factor, clincher - a point or fact or remark that settles something conclusively influence - a cognitive factor that tends to have an effect on what you do; "her wishes had a great influence on his thinking"
Adj.	1.	determinative - having the power or quality of deciding; "the crucial experiment"; "cast the deciding vote"; "the determinative (or determinant) battle" deciding, determinant, determining decisive - determining or having the power to determine an outcome; "cast the decisive vote"; "two factors had a decisive influence"