Source : Webster's Revised Unabridged Dictionary (1913)

Evocation \Ev`o*ca"tion\, n. [L. evocatio: cf. F. ['e]vocation.]
   The act of calling out or forth. --Sir. T. Browne.

         The evocation of that better spirit.     --M. Arnold.

Source : WordNet®

evocation
     n 1: imaginative re-creation
     2: calling up supposed supernatural forces by spells and
        incantations [syn: {summoning}]
     3: stimulation that calls up (draws forth) a particular class
        of behaviors; "the elicitation of his testimony was not
        easy" [syn: {induction}, {elicitation}]