canonical
US /kəˈnɑː.nɪ.kəl/
UK /kəˈnɑː.nɪ.kəl/
1.
according to or ordered by canon law (ecclesiastical law)
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The decision was made according to canonical procedures.
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He studied canonical law at the seminary.
2.
included in the list of sacred books officially accepted as genuine
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The Gospel of John is a canonical book of the New Testament.
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Only canonical texts are used for theological study.
3.
conforming to a general rule or acceptable procedure; orthodox
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His approach to the problem was entirely canonical.
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The canonical form of the equation is simpler.