Dianoia (Greek: διάνοια, ratio in Latin) is a term used by Plato for a type of thinking, specifically about mathematical and technical subjects. It is the capacity for, process of, or result of discursive thinking, in contrast with the immediate apprehension that is characteristic of noesis. In Aristotle, knowledge is further divided into the theoretical (episteme), and the practical, which includes techne and phronesis.

Dianoia is also the quarterly newsletter of the International Council for Industrial and Applied Mathematics.

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