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square root

noun

  1. 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.



square root

noun

  1. 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

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


square root

  1. 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

  1. 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.


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Notes

The square roots of many numbers, such as three, are irrational numbers .
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Word History and Origins

Origin of square root1

First recorded in 1550–60

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