Source : Webster's Revised Unabridged Dictionary (1913)

Cessor \Ces"sor\, n. [From {Cess}, v. i. Cf. {Cesser}.] (Law)
   One who neglects, for two years, to perform the service by
   which he holds lands, so that he incurs the danger of the
   writ of cessavit. See {Cessavit}. --Cowell.

Cessor \Ces"sor\, n. [From {Cess}, v. t.]
   An assessor. [Obs.]