square root


Definition of square root 

: a factor of a number that when squared gives the number the square root of 9 is ±3

Examples of square root in a Sentence

The square root of 9 is 3.

Recent Examples on the Web

This moment shows where his creativity flourishes — at the square root of super-seriousness and total innocence. Giovanni Russonello, New York Times, "For Milford Graves, Jazz Innovation Is Only Part of the Alchemy," 26 Apr. 2018 The income points in the study apply to single-person households, the authors note, but can be determined for families by multiplying the figure by the square root of a household size. Josh Hafner, USA TODAY, "Does money equal happiness? It does, but only until you earn this much," 26 Feb. 2018 This distinguishes it again from more familiar irrational numbers like the square root of two (whose second power is equal to two). Dan Rockmore /, NBC News, "Pi Day spotlights one of math's most seductive numbers," 14 Mar. 2018 The square root of pie is $3.14 at Blaze Fast Fire'd Pizza on National Pi Day on Wednesday. Doreen Christensen, Sun-Sentinel.com, "Blaze pizzas for $3.14 for National Pi Day on Wednesday," 13 Mar. 2018 Every number has two square roots, one positive and one negative, and a similar doubling can occur in physics equations. Andrew Crumey, WSJ, "Review: Falling in Love With an Idea in ‘The Quantum Labyrinth’," 8 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'square root.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of square root

1557, in the meaning defined above

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Time Traveler for square root

The first known use of square root was in 1557

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More Definitions for square root

square root


English Language Learners Definition of square root

mathematics : a number that produces a specified number when it is multiplied by itself

square root


Kids Definition of square root

: a number that when multiplied by itself equals a specified number The square root of 9 is 3.

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