Source : Webster's Revised Unabridged Dictionary (1913)

Prorogation \Pro`ro*ga"tion\, n. [L. prorogatio: cf. F.
   prorogation.]
   1. The act of counting in duration; prolongation. [Obs.]
      --South.

   2. The act of proroguing; the ending of the session of
      Parliament, and postponing of its business, by the command
      of the sovereign. [Eng.]

   Note: After an adjournment all things continue as they were
         at the adjournment; whereas, after a prorogation, bill
         introduced and nut passed are as if they had never been
         begun at all. --Mozley & W.

Source : WordNet®

prorogation
     n : discontinuing the meetings (of a legislative body) without
         dissolving it