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From The Collaborative International Dictionary of English v.0.48:
Unlearn \Un*learn"\, v. t. [1st pref. un- + learn.] [1913 Webster] 1. To forget, as what has been learned; to lose from memory; also, to learn the contrary of. [1913 Webster] I had learned nothing right; I had to unlearn everything. --Milner. [1913 Webster] 2. To fail to learn. [Obs.] --Dr. H. More. [1913 Webster]