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# imaginary number

## noun

,

*Mathematics.*- Also called imaginary, pure imaginary number. a complex number having its real part equal to zero.

imaginary number

## noun

- any complex number of the form i
*b*, where i = √–1

imaginary number

/ ĭ-măj**′**ə-nĕr′ē /

- A type of complex number in which the multiple of
*i*(the square root of −1) is not equal to zero. Examples of imaginary numbers include 4*i*and 2 − 3*i*, but not 3 + 0*i*(which is just 3). - See more at complex number

## Discover More

## Word History and Origins

Origin of imaginary number^{1}

First recorded in 1905–10

## Discover More

## Example Sentences

A theory obeying the rules of quantum physics needs imaginary numbers to describe the real world, two new experiments suggest.

From Science News

Now from a quadric equation we derive, in like manner, the notion of a complex or imaginary number such as is spoken of above.

From Project Gutenberg

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