The Collaborative International Dictionary of English v.0.48:

Copyhold \Cop"y*hold`\, n. (Eng. Law)
   (a) A tenure of estate by copy of court roll; or a tenure for
       which the tenant has nothing to show, except the rolls
       made by the steward of the lord's court. --Blackstone.
   (b) Land held in copyhold. --Milton.
       [1913 Webster]

   Note: Copyholds do not exist in the United States.
         [1913 Webster]

WordNet (r) 3.0 (2006):

copyhold
    n 1: a medieval form of land tenure in England; a copyhold was a
         parcel of land granted to a peasant by the lord of the
         manor in return for agricultural services

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "copyhold":
   equitable estate, estate at sufferance, estate for life,
   estate for years, estate in expectancy, estate in fee,
   estate in possession, estate tail, fee, fee simple, fee tail, feod,
   feodum, feud, feudal estate, fief, lease, leasehold, legal estate,
   paramount estate, particular estate, remainder, reversion,
   vested estate



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

COPYHOLD, estate in the English law. A copyhold estate is a parcel of a
manor, held at the will of the lord, according to the custom of the manor,
by a grant from the lord, and admittance of the tenant, entered on the rolls
of the manor court. Cruise, Dig. t. 10, c. 1, s. 3. Vide Ch. Pr. Index, h.t.