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 4^{1/2} |
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. |
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.
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.