transitive verb.
To declare to be false; deny. synonym: deny.
transitive verb.
To oppose (someone), especially by contradiction.
The Century Dictionary and Cyclopedia
To speak against; contradict; oppose in words; deny or declare not to be true; controvert; dispute: applied to persons, or to propositions, declarations, or facts.
noun.
A gainsaying; opposition in words; contradiction.
the GNU version of the Collaborative International Dictionary of English
transitive verb.
To contradict; to deny; to controvert; to dispute; to forbid.