unbias

From un- +‎ bias.

unbias (third-person singular simple present unbiases or unbiasses, present participle unbiasing or unbiassing, simple past and past participle unbiased or unbiassed)

1. (transitive) To free (someone or something) from bias or prejudice.
   • 1708 January, [Jonathan Swift], “The Sentiments of a Church of England-man with Respect to Religion and Government”, in Miscellanies in Prose and Verse, London: […] John Morphew […], published 1711, →OCLC, page 98:

     But before Things proceed to open Violence, the trueſt Service a private Man may hope to do his Country, is by unbiaſſing his Mind as much as poſſible, and then endeavoring to moderate between the Rival Powers, […]

• Anubis, bunias, nubias