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

Part of that complexity is the ground beneath it all. —Elaine Rojas-Castillo, CBS News, 17 Apr. 2026

The story of the Chinese Mexican Chew family delved into the complexities of identity. —Carlos De Loera, Los Angeles Times, 17 Apr. 2026

The technology was produced using high-precision LIGA technology, with the flexible structures allowing for crisp and consistent chorographical functions and a reduction of complexity. —Fairchild Studio, Footwear News, 17 Apr. 2026

Light and lingering, the skin scent is achieved through white musk, plus a base of woody essential oils to add further complexity. —Kiana Murden, Vogue, 16 Apr. 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