• Webster's Revised Unabridged Dictionary
    • Disaffirm To assert the contrary of; to contradict; to deny; -- said of that which has been asserted.
    • Disaffirm (Law) To refuse to confirm; to annul, as a judicial decision, by a contrary judgment of a superior tribunal.
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Century Dictionary and Cyclopedia
    • disaffirm To deny; contradict.
    • disaffirm In law, to overthrow or annul, as in the reversal of a judicial decision, or where one, having made a contract while an infant, repudiates it after coming of age.
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Chambers's Twentieth Century Dictionary
    • v.t Disaffirm dis-af-fėrm′ to deny (what has been affirmed): to contradict
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In literature:

In case of the marriage of a minor the time for disaffirmance will commence from the date of the marriage.
"Legal Status Of Women In Iowa" by Jennie Lansley Wilson
As a minor may disaffirm his contract, any act clearly showing this intent is sufficient.
"Putnam's Handy Law Book for the Layman" by Albert Sidney Bolles