Canon has different meanings depending on the context. Here are some of the definitions:
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In fiction, canon refers to the body of works taking place in a particular fictional world that are widely considered to be official or authoritative, especially those created by the original author or developer of the world. Canon is contrasted with, or used as the basis for, works of fan fiction and other derivative works).
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In literature, canon can refer to an authoritative list of books accepted as Holy Scripture, the authentic works of a writer, or a sanctioned or accepted group or body of related works.
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In religion, canon refers to an ecclesiastical rule or law enacted by a council or other competent authority and, in the Roman Catholic Church, approved by the pope.
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In anime and manga, something being canon essentially means its true to the primary storyline. It refers to the original story and is considered "true" in the story. Non-canon refers to something that is not part of the original story.
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In biblical studies, the canon refers to the collection of Scriptures that Jews or Christians consider to have binding authority. Different Christian groups sometimes have different biblical canons.
In general, canon can refer to an accepted principle or rule, a criterion or standard of judgment, or a body of principles, rules, standards, or norms.
