'''Canon''' refers to a group of works considered to be central, vital, and legitimate in some field.
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'''Canon''' refers to a gun which shoots a canon ball.
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One of its more common uses is in describing which books are considered valid parts of the [[Bible]], with various [[denomination]]s using slightly different lists.
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In broader use, one sees applications such as "[[fan fiction]] is not considered canonical in the [[lore]] of [[Star Trek]]".
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A canon is also a compositional form in [[classical music]].