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Principal Square Root. The unique nonnegative square root of a nonnegative real number. For example, the principal square root of 9 is 3, although both and 3 are square roots of 9.
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. Discover our greatest slideshows.