The Collaborative International Dictionary of English v.0.48:

Valuable \Val"u*a*ble\, a.
   1. Having value or worth; possessing qualities which are
      useful and esteemed; precious; costly; as, a valuable
      horse; valuable land; a valuable cargo.
      [1913 Webster]

   2. Worthy; estimable; deserving esteem; as, a valuable
      friend; a valuable companion.
      [1913 Webster]

   Valuable consideration (Law), an equivalent or compensation
      having value given for a thing purchased, as money,
      marriage, services, etc. --Blackstone. --Bouvier.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Valuable \Val"u*a*ble\, n.
   A precious possession; a thing of value, especially a small
   thing, as an article of jewelry; -- used mostly in the
   plural.
   [1913 Webster]

         The food and valuables they offer to the gods. --Tylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

valuable
    adj 1: having great material or monetary value especially for
           use or exchange; "a valuable diamond" [ant: worthless]
    2: having worth or merit or value; "a valuable friend"; "a good
       and worthful man" [syn: valuable, worthful]
    n 1: something of value; "all our valuables were stolen"

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "valuable":
   admired, appreciated, beyond price, costly, dear, esteemed,
   expensive, gainful, golden, good as gold, inestimable, invaluable,
   of great price, of value, precious, priceless, prized, profitable,
   remunerative, respected, rewarding, rich, treasured, valued,
   well-spent, worthwhile, worthy, yielding a return