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1. A line going diagonally across the grain of fabric: Cut the cloth on the bias.
a. A preference or an inclination, especially one that inhibits impartial judgment.
b. An unfair act or policy stemming from prejudice.
3. A statistical sampling or testing error caused by systematically favoring some outcomes over others.
4. Sports
a. A weight or irregularity in a ball that causes it to swerve, as in lawn bowling.
b. The tendency of such a ball to swerve.
5. The fixed voltage applied to an electrode.
Slanting or diagonal; oblique: a bias fold.
tr.v. bi·ased, bi·as·ing, bi·as·es or bi·assed or bi·as·sing or bi·as·ses
1. To influence in a particular, typically unfair direction.
2. To apply a small voltage to (a grid).

[French biais, slant, from Provençal, perhaps ultimately from Greek epikarsios, slanted; see sker- in Indo-European roots.]
Synonyms: bias, jaundice, prejudice
These verbs mean to influence in a particular, often unfavorable way. To bias is to cause to incline toward or away from something or someone: claimed that the ruling was biased against low-income workers; was biased by experience in favor of stronger regulation.
To jaundice is to predispose toward negativity or skepticism: Years of scandal have jaundiced her view of politics.
To prejudice is to cause to judge prematurely, without full knowledge or due consideration; it often, but not always, suggests bigotry: were prejudiced by their narrow upbringing against those of a different race; moved the trial so as to find jurors who had not been prejudiced by news coverage of the case.


also bi·assed  (bī′əst)
Marked by or exhibiting bias; prejudiced: gave a biased account of the trial.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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also biassed
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
If the Portuguese were biassed by any particular views, another bias equally powerful may have deflected the Frenchman from the truth, for they evidently write with contrary designs: the Portuguese, to make their mission seem more necessary, endeavoured to place in the strongest light the differences between the Abyssinian and Roman Church; but the great Ludolfus, laying hold on the advantage, reduced these later writers to prove their conformity.
Flexibility of mind, a disposition easily biassed by others, is an attribute which you know I am not very desirous of obtaining; nor has Frederica any claim to the indulgence of her notions at the expense of her mother's inclinations.