Source : Webster's Revised Unabridged Dictionary (1913)

Arietation \Ar`i*e*ta"tion\, n. [L. arietatio.]
   1. The act of butting like a ram; act of using a
      battering-ram. [Obs.] --Bacon.

   2. Act of striking or conflicting. [R.] --Glanvill.