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definitive

Definitive describes something that is settled in a final way or something that is authoritative. (adjective)

  1. An example of something that would be described as definitive is a conclusive decision made by an authority figure.
  2. A use of the adjective definitive would be a definitive history book, which would be a complete history on a specific subject.

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See definitive in Webster's New World College Dictionary

See definitive in American Heritage Dictionary 4

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