The Collaborative International Dictionary of English v.0.48:

Circensial \Cir*cen"sial\, Circensian \Cir*cen"sian\, a. [L.
   Circensis, ludi Circenses, the games in the Circus Maximus.]
   Of or pertaining to, or held in, the Circus, In Rome.
   [1913 Webster]

         The pleasure of the Circensian shows.    --Holyday.
   [1913 Webster]