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The Collaborative International Dictionary
Unbias

Unbias \Un*bi"as\, v. t. [1st pref. un- + bias.] To free from bias or prejudice.
--Swift.

Douglas Harper's Etymology Dictionary
unbias

"to free from bias," 1708, from un- (2) "reverse, opposite of" + bias (v.).\n\nThe truest service a private man may hope to do his country is, by unbiassing his mind as much as possible. [Swift, "The Sentiments of a Church of England Man with respect to Religion and Government," 1708]

Wiktionary
unbias

vb. (context transitive English) To free from bias or prejudice.