imaginary part


Definition of imaginary part

: the part of a complex number (such as 3i in 2 + 3i) that has the imaginary unit as a factor

Examples of imaginary part in a Sentence

Recent Examples on the Web Complex numbers are made up of a real part and an imaginary part. Quanta Magazine, "The (Imaginary) Numbers at the Edge of Reality," 25 Oct. 2018

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

First Known Use of imaginary part

1747, in the meaning defined above

Keep scrolling for more

Learn More about imaginary part

Time Traveler for imaginary part

Time Traveler

The first known use of imaginary part was in 1747

See more words from the same year

Statistics for imaginary part

Cite this Entry

“Imaginary part.” The Dictionary, Merriam-Webster Inc., Accessed 6 December 2019.

Comments on imaginary part

What made you want to look up imaginary part? Please tell us where you read or heard it (including the quote, if possible).


very cautious or careful

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!