Opponency

Op·po'nen·cy noun The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree. [ Eng.] Todd.
Found on http://www.encyclo.co.uk/webster/O/26

Opponency

• (n.) The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree.
Found on http://thinkexist.com/dictionary/meaning/opponency/
No exact match found