noun
a word or phrase that expresses a quality or attribute of the referent, typically placed before a noun
adjective
serving to determine or limit
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The determinative factor in the decision was the financial viability of the project.
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The determinative thing that made me choose this restaurant was the good reviews.
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The determinative element in acing the exam is studying the night before.
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Her smile was the determinative force that brightened up his day.