The Collaborative International Dictionary of English v.0.48:

Responsion \Re*spon"sion\ (-sh?n), n. [L. responsio. See
   Respond.]
   1. The act of answering. [Obs.]
      [1913 Webster]

   2. (University of Oxford) The first university examination;
      -- called also little go. See under Little, a.
      [1913 Webster]