The Collaborative International Dictionary of English v.0.48:

Compute \Com*pute"\ (k[o^]m*p[=u]t"), v. t. [imp. & p. p.
   Computed; p. pr. & vb. n. Computing.] [L. computare. See
   Count, v. t.]
   To determine by calculation; to reckon; to count.
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         Two days, as we compute the days of heaven. --Milton.
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         What's done we partly may compute,
         But know not what's resisted.            --Burns.

   Syn: To calculate; number; count; reckon; estimate;
        enumerate; rate. See Calculate.
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The Collaborative International Dictionary of English v.0.48:

Compute \Com*pute"\, n. [L. computus: cf. F. comput.]
   Computation. [R.] --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

compute
    v 1: make a mathematical calculation or computation [syn:
         calculate, cipher, cypher, compute, work out,
         reckon, figure]