square root

noun

: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Unlike the more familiar real numbers – positive and negative integers, fractions, square roots, cube roots and even numbers such as pi – complex numbers have an imaginary component. William Ross, The Conversation, 10 Mar. 2025 Other rings of integers can be built out of sets of numbers that include, say, the square root of −1 (the imaginary number that mathematicians call i), or the cube root of 2. Joseph Howlett, WIRED, 9 Mar. 2025 Another, following a different set of rules, might read one number and print its square root. Charlie Wood, Quanta Magazine, 7 Mar. 2025 The square root of a number x is a value y such that when y is squared the value is x. Lance Eliot, Forbes, 20 Feb. 2025 See All Example Sentences for square root

Word History

First Known Use

1557, in the meaning defined above

Time Traveler
The first known use of square root was in 1557

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Cite this Entry

“Square root.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/square%20root. Accessed 31 Mar. 2025.

Kids Definition

square root

noun
: a number that when squared equals a specified number
+3 and -3 are both a square root of 9

More from Merriam-Webster on square root

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