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

At 100 kW per rack, skilled teams could manage the integration complexity. — Deania Davidson, Forbes.com, 27 July 2026

The company says its manufacturing approach could help reduce the complexity and cost of producing large fusion systems. — Neetika Walter, Interesting Engineering, 27 July 2026

When asked about the complexity of Spagnuolo’s nickel assignment, Canady expressed confidence based on his diverse college experience. — Pete Sweeney, Kansas City Star, 26 July 2026

Families of children with medical complexity spend a median of two hours a week just coordinating care, on top of 11 to 15 hours of direct home care. — Danielle Stephens, USA Today, 26 July 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