Source : Webster's Revised Unabridged Dictionary (1913)

Calculation \Cal`cu*la"tion\ (-l[=a]"sh[u^]n), n. [OE.
   calculation, fr. L. calculatio; cf. OF. calcucation.]
   1. The act or process, or the result, of calculating;
      computation; reckoning, estimate. ``The calculation of
      eclipses.'' --Nichol.

            The mountain is not so his calculation makes it.
                                                  --Boyle.

   2. An expectation based on circumstances.

            The lazy gossips of the port, Abhorrent of a
            calculation crost, Began to chafe as at a personal
            wrong.                                --Tennyson.

Source : WordNet®

calculation
     n 1: the procedure of calculating; determining something by
          mathematical or logical methods [syn: {computation}, {computing}]
     2: problem solving that involves numbers or quantities [syn: {computation},
         {figuring}, {reckoning}]
     3: planning something carefully and intentionally; "it was the
        deliberation of his act that was insulting" [syn: {deliberation}]