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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.
Wiktionary (0.00 / 0 votes) Rate this definition: square root (Noun). Of a number, another number which, when squared, yields the original number; sometimes constrained to be the positive number when two solutions exist.