any number expressed as

*a*+*bi*, where*a*and*b*are real numbers and*i*is the imaginary unit, : if*b*is zero the expression is a real number, but if*b*is not zero the expression is an imaginary number any number expressed as *a* + *bi*, where *a* and *b* are real numbers and *i* is the imaginary unit, : if *b* is zero the expression is a real number, but if *b* is not zero the expression is an imaginary number

Webster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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"Complex number." *YourDictionary*. LoveToKnow. www.yourdictionary.com/complex-number.

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Complex number. (n.d.). In *YourDictionary*. Retrieved from https://www.yourdictionary.com/complex-number

noun

Any number of the form *a* + *bi,* where *a* and *b* are real numbers and *i* is an imaginary number whose square equals −1.

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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"Complex number." *YourDictionary*. LoveToKnow. www.yourdictionary.com/complex-number.

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Complex number. (n.d.). In *YourDictionary*. Retrieved from https://www.yourdictionary.com/complex-number

A number that can be expressed in terms of *i* (the square root of −1). Mathematically, such a number can be written *a* + *bi,* where *a* and *b* are real numbers. An example is 4 + 5*i.*

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**MLA Style**

"Complex number." *YourDictionary*. LoveToKnow. www.yourdictionary.com/complex-number.

**APA Style**

Complex number. (n.d.). In *YourDictionary*. Retrieved from https://www.yourdictionary.com/complex-number

Noun

(*plural* complex numbers)

- (complex analysis) A number of the form
*a + bi*, where*a*and*b*are real numbers and*i*denotes the imaginary unit

English Wiktionary. Available under CC-BY-SA license.

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**MLA Style**

"Complex number." *YourDictionary*. LoveToKnow. www.yourdictionary.com/complex-number.

**APA Style**