The Collaborative International Dictionary of English v.0.48:

Thrift \Thrift\ (thr[i^]ft), n. [Icel. [thorn]rift. See
   Thrive.]
   1. A thriving state; good husbandry; economical management in
      regard to property; frugality.
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            The rest, . . . willing to fall to thrift, prove
            very good husbands.                   --Spenser.
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   2. Success and advance in the acquisition of property;
      increase of worldly goods; gain; prosperity. "Your thrift
      is gone full clean." --Chaucer.
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            I have a mind presages me such thrift. --Shak.
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   3. Vigorous growth, as of a plant.
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   4. (Bot.) One of several species of flowering plants of the
      genera Statice and Armeria.
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   Common thrift (Bot.), Armeria vulgaris; -- also called
      sea pink.
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   Syn: Frugality; economy; prosperity; gain; profit.
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WordNet (r) 3.0 (2006):

thrift
    n 1: any of numerous sun-loving low-growing evergreens of the
         genus Armeria having round heads of pink or white flowers
    2: extreme care in spending money; reluctance to spend money
       unnecessarily [syn: parsimony, parsimoniousness,
       thrift, penny-pinching]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "thrift":
   austerity, austerity program, canniness, care, carefulness,
   chariness, economic planning, economicalness, economizing, economy,
   economy of means, false economy, forehandedness, frugality,
   frugalness, good management, husbandry, management, miserliness,
   niggardliness, parsimoniousness, parsimony, penuriousness,
   providence, prudence, prudential administration, saving, scrimping,
   skimping, sparingness, stinginess, thriftiness,
   tight purse strings, unwastefulness