complexity

noun

com·​plex·​i·​ty kəm-ˈplek-sə-tē 

käm-

plural complexities

1

: something complex

the complexities of the murder trial

2

: the quality or state of being complex

the complexity of the contract

Synonyms of complexity

• complexness
• sophistication
• intricacy
• elaborateness

Examples of complexity in a Sentence

He was impressed by the complexity of the music.

The diagram illustrates the complexity of the cell's structure.

He doesn't grasp the complexity of the situation.

Recent Examples on the Web

In this stunningly beautiful novel, Desai captures the complexity and nuance of living across cultures. — Literary Hub, 12 Nov. 2026

These include complexities around jurisdiction limits, enforcement, and the fact that severe negative effects on human beings, other species, and natural resources can take years to be fully visible. — Encyclopedia Britannica, 12 Nov. 2026

Consider a cybersecurity company claiming to reduce operational complexity. — Susan Thomas, Forbes.com, 12 Nov. 2026

There are a variety of complexities that would impact those calculations. — Michael McCann, Sportico.com, 12 Nov. 2026

Word History

Etymology

complex entry 2 + -ity, perhaps after French complexité

First Known Use

1661, in the meaning defined at sense 1

Rhymes for complexity

• convexity
• perplexity

Kids Definition

complexity

noun

com·​plex·​i·​ty kəm-ˈplek-sət-ē 

käm-

plural complexities

1

: something complex

the complexities of the English language

2

: the quality or state of being complex