Main Entry: de·ter·mi·na·tive

Pronunciation: \-ˈtər-mə-ˌnā-tiv, -ˈtər-mə-nə-\

Function: adjective

Date: 1655

: having power or tendency to determine : tending to fix, settle, or define something <regard experiments as determinative of the principles from which deductions could be made — S. F. Mason>

synonyms see conclusive

— determinative noun