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From The Collaborative International Dictionary of English v.0.48:
Visualize \Vis"u*al*ize\, v. t. 1. To make visual, or visible. [Written also visualise.] [1913 Webster] 2. to see in the imagination; to form a mental image of. [1913 Webster +PJC] No one who has not seen them [glaciers] can possibly visualize them. --Lubbock. [1913 Webster]