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

That same year, Wolfram set out on an ambitious new direction in science aimed at understanding the origins of complexity in nature. — Big Think, 4 Aug. 2026

Meanwhile, a juxtaposition of the subtle sweetness of water lily and jasmine adds further complexity. — Jenny Berg, Vogue, 4 Aug. 2026

Jaunt Air Mobility now plans to address that challenge with a new battery system for its next-generation VTOL drones that promises liquid-cooling performance without the complexity of liquid cooling. — Aamir Khollam, Interesting Engineering, 3 Aug. 2026

The result is a further layer of complexity in what has become a series of overlapping conflicts that have defied resolution and risk inflicting even greater harm on the world economy in the weeks and months ahead. — Kristian Coates Ulrichsen, The Conversation, 3 Aug. 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