The Collaborative International Dictionary of English v.0.48:

Landlord \Land"lord`\, n. [See Land, and Lord.]
   1. The lord of a manor, or of land; the owner of land or
      houses which he leases to a tenant or tenants.
      [1913 Webster]

   2. The master of an inn or of any form of lodging house; as,
      the landlord collects the rents on the first of the month.
      [1913 Webster +PJC]

            Upon our arrival at the inn, my companion fetched
            out the jolly landlord.               --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

landlord
    n 1: a landowner who leases to others