1. An inclination or prejudice for or against one person or group, especially in a way considered to be unfair
The judge was accused of bias against the defendant.
O juiz foi acusado de ter viés contra o réu.
2. A systematic distortion of a measurement from its true value
The survey had a sampling bias that skewed the results.
A pesquisa tinha um viés de amostragem que distorceu os resultados.