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confutation (n.)

"act of disproving or proving to be false," mid-15c., from Latin confutationem (nominative confutatio), noun of action from past-participle stem of confutare "repress, check; disprove, restrain, silence," from assimilated form of com-, here perhaps an intensive prefix (see con-), + *futare "to beat," which is perhaps from PIE root *bhau- "to strike." Confutation of the person in logic is argument ad hominem.

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disproof (n.)

"proof to the contrary, confutation, refutation," 1530s, after disprove; see dis- + proof (n.). Earlier was dispreve (c. 1400), from dispreven (late 14c.), from Old French tonic stem of desprover.

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