|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|
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.