square root

noun
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.

Origin:
1550–60

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Collins
World English Dictionary
square root
 
n
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 10th Edition
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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

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.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

square root

in mathematics, a factor of a number that, when multiplied by itself, gives the original number. For example, both 3 and -3 are square roots of 9. As early as the 2nd millennium BC, the Babylonians possessed effective methods for approximating square roots. See root

Learn more about square root with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The distance between to vectors described as the square root of the squares of the vectors.
Definition of square root, possibly with links to more information and implementations.
These were the exponential function and the square root function.
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