The Collaborative International Dictionary of English v.0.48:

Squander \Squan"der\ (skw[o^]n"d[~e]r), v. t. [imp. & p. p.
   Squandered (-d[~e]rd); p. pr. & vb. n. Squandering.] [Cf.
   Scot. squatter to splash water about, to scatter, to
   squander, Prov. E. swatter, Dan. sqvatte, Sw. sqv[aum]tta to
   squirt, sqv[aum]ttra to squander, Icel. skvetta to squirt
   out, to throw out water.]
   1. To scatter; to disperse. [Obs.]
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            Our squandered troops he rallies.     --Dryden.
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   2. To spend lavishly or profusely; to spend prodigally or
      wastefully; to use without economy or judgment; to
      dissipate; as, to squander an estate.
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            The crime of squandering health is equal to the
            folly.                                --Rambler.
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   Syn: To spend; expend; waste; scatter; dissipate.
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The Collaborative International Dictionary of English v.0.48:

Squander \Squan"der\, v. i.
   1. To spend lavishly; to be wasteful.
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            They often squandered, but they never gave.
                                                  --Savage.
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   2. To wander at random; to scatter. [R.]
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            The wise man's folly is anatomized
            Even by squandering glances of the fool. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Squander \Squan"der\, n.
   The act of squandering; waste.
   [1913 Webster]

WordNet (r) 3.0 (2006):

squander
    v 1: spend thoughtlessly; throw away; "He wasted his inheritance
         on his insincere friends"; "You squandered the opportunity
         to get and advanced degree" [syn: waste, blow,
         squander] [ant: conserve, economise, economize,
         husband]
    2: spend extravagantly; "waste not, want not" [syn: consume,
       squander, waste, ware]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "squander":
   ablate, absorb, assimilate, bleed white, blow, budget, burn up,
   consume, cost, cost out, decrease, deplete, depreciate, digest,
   disburse, dissipate, drain, drain of resources, dribble away, eat,
   eat up, erode, exhaust, expend, extravagancy, finish, finish off,
   fool away, fork out, fritter, gamble away, go through, gobble,
   gobble up, hang the expense, impoverish, incur costs, ingest,
   invest, lavish, lavishness, lay out, open the purse, outlay,
   overdoing, pay, pay out, prodigality, put out, run through,
   scatter, schedule, seize the day, shell out, shrink, sink money in,
   slather, sow broadcast, spend, splurge, suck dry, swallow,
   swallow up, throw, throw away, throw money around, use up, waste,
   waste away, wastefulness, wear, wear away