The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Sejant rampant, sitting with the forefeet lifted up. --Wright. [1913 Webster]