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

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

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.

If someone has a complex about something, they have a mental or emotional problem relating to it, often because of an unpleasant experience in the past.

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

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

Dec 14, 2025 · complex (comparative more complex or (nonstandard) complexer, superlative most complex or (nonstandard) complexest) Made up of multiple parts; composite; not simple. quotations …

Definitions of complex (/kəmˈplɛks/) adjective complicated in structure; consisting of interconnected parts “a complex set of variations based on a simple folk melody” “a complex mass of diverse laws and …

COMPLEX meaning: 1 : having parts that connect or go together in complicated ways; 2 : not easy to understand or explain not simple