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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. A sexual position similar to a threesome, only with four people in a square formation. Usually involving two men and two women they all lie in a square formation, with the men facing inwards and women facing outwards. So each person is giving oral and revieving oral, and no two people of the same sex touch eachother. Dave invited his best mate and two women over to his house for a square root.