This disambiguation page lists articles associated with the title Complex. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. COMPLEX meaning: 1. involving a lot of different but related parts: 2. difficult to understand or find an answer to…. Learn more. COMPLEX definition: 1. involving a lot of different but related parts: 2. difficult to understand or find an answer to…. Learn more. In general English, complex refers to something consisting of multiple parts, intricate or not easy to understand or analyze because of its various interconnected elements. complex, complicated, intricate, involved, knotty mean having confusingly interrelated parts. complex suggests the unavoidable result of a necessary combining and does not imply a fault or failure. Complex covers music, sneakers, style, and pop culture — breaking news, exclusive interviews, and the latest drops, all in one place. COMPLEX definition: composed of many interconnected parts; compound; composite. See examples of complex used in a sentence.