Plane geometric figure with four congruent sides and four right angles.

The term is also used to refer to a measure of area such as the square metre.

Historical note

Originally, the term “square” referred to the geometric figure we still call a square. Greek mathematicians later used the term “square” to refer to the more abstract concept of a number \(c^{2}\) which represents the area of a square with side length c units.

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