square of opposition

noun

Logic.

1. a diagrammatic representation of the opposition of categorical propositions.

square of opposition

noun

1. See opposition

Word History and Origins

Origin of square of opposition¹

First recorded in 1860–65

Example Sentences

But from an early period in the history of Logic, the word was extended to cover mere differences in Quantity and Quality among the four forms A E I O, which differences have been named and exhibited symmetrically in a diagram known as: The Square of Opposition.

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It was called the Square of Opposition, because it was intended to illustrate the doctrine of Opposition in Aristotle's sense and the ordinary sense of repugnance or incompatibility.

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Hence it was called the Square of Opposition.

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The Square of Opposition 89 §10.

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And, as to Opposition, if we recognise four forms of Hypothetical A. I. E. O., these plainly stand to one another in a Square of Opposition, just as Categoricals do.

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