It serves as an adjective, a noun, and, less commonly, as a verb. The verb use is the oldest of the three, with an original meaning of “to join or unite.” Complex comes from the Latin complecti, which means …

It's a very complex issue to which there is no straightforward answer. The film's plot was so complex that I couldn't follow it.

COMPLEX definition: composed of many interconnected parts; compound; composite. See examples of complex used in a sentence.

Complex implies a combination of many interwoven parts: The composer transformed a simple folk tune into a complex set of variations. Complicated stresses a relationship of parts that affect each other in …

The latest news, stats, scores and schedules for the Arizona Complex League, a rookie-level circuit of Minor League Baseball in the state of Arizona

A whole composed of interconnected or interwoven parts. A complex of cities and suburbs; the military-industrial complex.

Feb 21, 2026 · complex (third-person singular simple present complexes, present participle complexing, simple past and past participle complexed) (chemistry, intransitive) To form a complex with another …