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.
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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]