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Definition of Canonical form
1. Noun. (mathematics) A standard or normal presentation of a mathematical entity ¹
2. Noun. (chemistry) Any of a set of representations of the resonance structure of a molecule each of which contributes to the real structure; a contributing structure ¹
3. Noun. (linguistics) (rare) dictionary form. a basic form of a word used as a dictionary entry. ¹
¹ Source: wiktionary.com