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confirmatory

or confirmative

[kuh n-fur-muh-tawr-ee, -tohr-ee] /kənˈfɜr məˌtɔr i, -ˌtoʊr i/
adjective
1.
serving to confirm; corroborative.
Origin of confirmatory
1630-1640
1630-40; < Medieval Latin confirmātōrius, equivalent to Latin confirmā(re) (see confirm) + -tōrius -tory1
Related forms
nonconfirmative, adjective
nonconfirmatory, adjective
unconfirmative, adjective
unconfirmatory, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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