Source : Webster's Revised Unabridged Dictionary (1913)

Sejant \Se"jant\, Sejeant \Se"jeant\, a. [F. s['e]ant, p. pr. of
   seoir to sit, L. sedere.] (Her.)
   Sitting, as a lion or other beast.

   {Sejant rampant}, sitting with the forefeet lifted up.
      --Wright.