bias noun (PREFERENCE)
C2 [C usually singular, U] the action of supporting or opposing a particular person or thing in an unfair way, because of allowing personal opinions to influence your judgment:
The senator has accused the media of bias.
Reporters must be impartial and not show political bias.
There was clear evidence of a strong bias against her.
There has always been a slight bias in favour of/towards employing liberal arts graduates in the company.