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

• complexness
• complicacy
• complicatedness
• complication
• elaborateness
• intricacy
• intricateness
• involution
• knottiness
• sophistication

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

The challenges are not just about the volume but also the complexity and fragmentation of data generated by sensors, machines, and smart factories. —Steve Banker, Forbes, 19 Feb. 2025

That process can take months or even years, depending on the project’s complexity. —Lisa Friedman, New York Times, 19 Feb. 2025

Industry groups should push for qualified leadership appointments at crucial agencies like the DEA, FDA and USDA—officials who understand both cannabis policy complexities and public health implications. —Ricardo Baca, Rolling Stone, 19 Feb. 2025

The complexity of the Plutonian system is reflected in the complexity of Pluto itself. —Jeffrey Kluger, TIME, 18 Feb. 2025

Word History

Etymology

complex entry 2 + -ity, perhaps after French complexité

First Known Use

1661, in the meaning defined at sense 1

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