The Collaborative International Dictionary of English v.0.48:

Cessavit \Ces*sa"vit\, n. [L., he has ceased.] [O. Eng. Law]
   A writ given by statute to recover lands when the tenant has
   for two years failed to perform the conditions of his tenure.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

CESSAVIT, Eng. law. An obsolete writ, which could formerly have been sued
out when the defendant had for two years ceased or neglected to perform such
service or to pay such rent as he was bound to do by his tenure, and had not
upon his lands sufficient goods or chattels to be distrained. F. N. B. 208.