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Adjective: confirmatory  kun'fur-mu,to-ree [N. Amer], kun'fur-mu-tree or ,kón-fu(r)'mey-tu-ree [Brit]
  1. Serving to support or corroborate
    "The confirmatory test results validated the initial diagnosis";
    - collateral, confirmative, confirming, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying

See also: supportive