One of the mysteries of the English language finally explained.
1The innate human faculty of reasoning.
2Theology. Human reasoning or its conclusions, as distinguished from divine revelation.
Late Middle English; earliest use found in Exemplification Duke of Gloucester. From natural + reason.
natural reason/ˌnatʃ(ə)r(ə)l ˈriːzn//ˌnatʃ(ə)rəl ˈriːzn/
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