Implicit / Unconscious Bias
"Original definition (neutral) - Any personal preference, attitude, or expectation that unconsciously affects a person's outlook or behaviour.
Current definition (negative) - Unconscious favouritism towards or prejudice against people of a particular race, gender, or group that influences one's actions or perceptions; an instance of this."
"unconscious bias, n." OED Online, Oxford University Press, December 2020, www.oed.com/view/Entry/88686003.
"Thoughts and feelings are “implicit” if we are unaware of them or mistaken about their nature. We have a bias when, rather than being neutral, we have a preference for (or aversion to) a person or group of people. Thus, we use the term “implicit bias” to describe when we have attitudes towards people or associate stereotypes with them without our conscious knowledge."
https://perception.org/research/implicit-bias/
Confirmation Bias – "Originating in the field of psychology; the tendency to seek or favour new information which supports one’s existing theories or beliefs, while avoiding or rejecting that which disrupts them."
Addition of definition to the Oxford Dictionary in 2019
"confirmation, n." OED Online, Oxford University Press, December 2020, www.oed.com/view/Entry/38852.
Simply put, confirmation bias is the tendency to seek out and/ or interpret new information as confirmation of one's existing beliefs or theories and to exclude contradictory or opposing information or points of view.