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confirmatory

or con·firm·a·tive

[kuh n-fur-muh-tawr-ee, -tohr-ee or kuh n-fur-muh-tiv]
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adjective
  1. serving to confirm; corroborative.
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Origin of confirmatory

1630–40; < Medieval Latin confirmātōrius, equivalent to Latin confirmā(re) (see confirm) + -tōrius -tory1
Related formsnon·con·firm·a·tive, adjectivenon·con·firm·a·to·ry, adjectiveun·con·firm·a·tive, adjectiveun·con·firm·a·to·ry, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018