D defs.my
Entry 1 sense Webster, 1913

Opponency

· Op·po·nen·cy · IPA
01 n. The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree.
  1. 1.
    The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree.[Eng.]