Source : Webster's Revised Unabridged Dictionary (1913)

Sublease \Sub"lease`\, n. (Law)
   A lease by a tenant or lessee to another person; an
   underlease. --Bouvier.

Source : WordNet®

sublease
     n : a lease from one lessee to another [syn: {sublet}]
     v : lease or rent all or part of (a leased or rented property)
         to another person; "We sublet our apartment over the
         summer" [syn: {sublet}]