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a quantity of which a given quantity is the square:
The quantities +6 and −6 are square roots of 36 since (+6)×(+6)=36 and (−6)×(−6)=36.
a number or quantity that when multiplied by itself gives a given number or quantity: 2 is a square root of 4, usually written √4 or 41/2
square root
A number that, when squared, yields a given number. For example, since 5 × 5 = 25, the square root of 25 (written √25) is 5.

square root definition

A number that, when multiplied by itself, will result in a given number. The square root of four is two; the square root of one hundred is ten.

Note: The square roots of many numbers, such as three, are irrational numbers.


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  • Square-serif

    noun, Typography. 1. a font of type having serifs with a weight equal to or greater than that of the main strokes. Compare Egyptian (def 5).

  • Square-set

    noun, Mining. 1. a set having 12 timbers joined to form eight 90° solid angles.

  • Square-shake

    noun 1. square deal.

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