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Synonyms

complexity

American  
[kuhm-plek-si-tee] / kəmˈplɛk sɪ ti /

noun

plural

complexities
  1. the state or quality of being complex; intricacy.

    the complexity of urban life.

  2. something complex.

    the complexities of foreign policy.


complexity British  
/ kəmˈplɛksɪtɪ /

noun

  1. the state or quality of being intricate or complex

  2. something intricate or complex; complication

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • intercomplexity noun
  • overcomplexity noun
  • supercomplexity noun

Etymology

Origin of complexity

First recorded in 1715–25; complex + -ity

Explanation

Is the movie simple or does it have lots of plot twists and intricate relationships between characters? If the latter is true, the movie's complexity makes it hard to understand. When you see the word complexity, think of something with a lot of pieces, something not easy to put into words or understand. Things that can have complexity include: the events leading up to the American Civil War, a broth made with many ingredients, your relationship with your parents. Complexity is the opposite of simplicity. When something has a lot of complexity, you say it is complex. When it has very little complexity, it is simple.

Keep Reading on Vocabulary.com

Vocabulary lists containing complexity

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

O'Neill said she had joined "at a time when our industry is operating in an environment of conflict and complexity".

From BBC • Apr. 28, 2026

BP "has been working relentlessly to keep our assets producing safely, reliably and efficiently," while working "in an environment of conflict and complexity," O'Neill said.

From Barron's • Apr. 28, 2026

“There’s a lot of complexity around payments,” she said.

From MarketWatch • Apr. 25, 2026

I had a long pattern of choosing unavailable men, telling myself it was because I could handle the complexity.

From Los Angeles Times • Apr. 24, 2026

He stared up at the stars: and it seemed to him then that they were dancers, stately and graceful, performing a dance almost infinite in its complexity.

From "Stardust" by Neil Gaiman