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

COMPLEX definition: 1. involving a lot of different but related parts: 2. difficult to understand or find an answer to…. Learn more.

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Complex should be used to say that something consists of several parts rather than that it is difficult to understand, analyse, or deal with, which is what complicated inherently means.

Definition of complex adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

There are five meanings listed in OED's entry for the noun complex, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

an intricate or complicated association or assemblage of related things, parts, units, etc.: the entire complex of our educational system; an apartment complex.

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

• Some of the problems are highly complex and unique in that lives are at stake depending on their successful resolution. • The Aborigines have a highly complex civilization, one that has existed for …