The Collaborative International Dictionary of English v.0.48:

Ld \Ld.\ n.
   The abbreviation for limited, term appended to the name of
   a company that is organized to give its owners limited
   liability; also abbreviated Ltd. It corresponds to Inc.
   in the United States. [Chiefly British] [abbr.]

   Syn: limited company, Ltd.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Ltd \Ltd.\ n.
   A term attached to the name of a company that is organized to
   give its owners limited liability; it corresponds to Inc.
   in the United States. [British]

   Syn: limited company, Ld.
        [WordNet 1.5]