The Collaborative International Dictionary of English v.0.48:

Leasehold \Lease"hold`\, a.
   Held by lease.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leasehold \Lease"hold`\, n.
   A tenure by lease; specifically, land held as personalty
   under a lease for years.
   [1913 Webster]

WordNet (r) 3.0 (2006):

leasehold
    n 1: land or property held under a lease

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "leasehold":
   adverse possession, alodial, alodium, burgage, claim, colony,
   copyhold, de facto, de jure, dependency, derivative title,
   equitable estate, estate at sufferance, estate for life,
   estate for years, estate in expectancy, estate in fee,
   estate in possession, estate tail, fee, fee fief, fee position,
   fee simple, fee simple absolute, fee simple conditional,
   fee simple defeasible, fee simple determinable, fee tail, feod,
   feodum, feud, feudal estate, fief, fiefdom, frankalmoign,
   free socage, freehold, gavelkind, having title to, hold, holding,
   knight service, lay fee, lease, legal claim, legal estate,
   legal possession, mandate, occupancy, occupation, original title,
   owning, paramount estate, particular estate, possessing,
   possession, preoccupancy, preoccupation, prepossession,
   prescription, property, property rights, proprietary rights,
   remainder, reversion, seisin, socage, squatting, sublease, tenancy,
   tenantry, tenure, tenure in chivalry, title, underlease,
   undertenancy, usucapion, vested estate, villein socage,
   villeinhold, villenage