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In works describing a potentially controversial topic, '''bias''' refers to the tendency of an author who holds a particular viewpoint to express that viewpoint (whether intentionally or subconsciously) in his work. This typically goes against the ideal of compendiums which are meant to be neutral, such as encyclopedias. For example, if an article on [[abortion]] is written by someone who supports it, it will likely be biased towards that viewpoint, and vice versa.