@jdpls a simple search on google:
bias
/ˈbʌɪəs/
noun
1.
inclination or prejudice for or against one person or group, especially in a way considered to be unfair.
And a simple search on wikipedia:
Bias is a disproportionate weight in favor of or against an idea or thing, usually in a way that is closed-minded, prejudicial, or unfair. Biases can be innate or learned. People may develop biases for or against an individual, a group, or a belief.