Source : Webster's Revised Unabridged Dictionary (1913)

Irrision \Ir*ri"sion\, n. [L. irrisio, fr. irridere, irrisum. to
   laugh at; pref. ir- in + ridere to laugh: cf. F. irrision.]
   The act of laughing at another; derision.

         This being spoken sceptic[`e], or by way of irrision.
                                                  --Chapman.