An inclination, tendency, predisposition towards
A biased source is one in which the author is taking a certain perspective in regards to the information. We all have biases and someone with a bias can still produce a credible source. It is up to you to decide how much of a bias is present and if it is still a worthwhile source. Be aware if a source is trying to persuade or trying to sell you something. Use the criteria below to determine bias.
Based on a University of Texas libguide.