What is the meaning of determinative?

noun

• One of a limited class of noun modifiers that determine the referents of noun phrases.
  • synonyms: determiner
• A determining or causal element or factor.
  • usage: "education is an important determinant of one's outlook on life"
  • synonyms: determinant, determiner, determining factor, causal factor

adjective

• Having the power or quality of deciding.
  • usage: "the crucial experiment"; "cast the deciding vote"; "the determinative (or determinant) battle"
  • synonyms: deciding, determinant, determining