noun, plural com·plex·i·ties for 2.
- the state or quality of being complex; intricacy: the complexity of urban life.
- something complex: the complexities of foreign policy.
noun plural -ties
- the state or quality of being intricate or complex
- something intricate or complex; complication
n.1721, “composite nature,” from complex (adj.) + -ity. Meaning “intricacy” is from 1790. Meaning “a complex condition” is from 1794.