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Meaning of “complex” in the English Dictionary

"complex" in British English

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complexadjective

uk   /ˈkɒm.pleks/ /kəmˈpleks/ us   /kɑːmˈpleks/ /ˈkɑːm.pleks/
B2 involving a lot of different but related parts: a complex molecule/carbohydrate a complex network of roads a complex procedure The company has a complex organizational structure.
B2 difficult to understand or find an answer to because of having many different parts: 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.

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complexnoun [C]

uk   /ˈkɒm.pleks/ us   /ˈkɑːm.pleks/
  • complex noun [C] (BAD FEELING)

C2 a particular anxiety or unconscious fear that a person has, especially as a result of an unpleasant experience that they have had in the past or because they have a low opinion of their own worth: an inferiority complex I think he's got a complex about being bald. Don't go on about her weight - you'll give her a complex!
(Definition of complex from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"complex" in American English

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complexadjective

us   /kəmˈpleks, ˈkɑm·pleks/
having many parts related to each other in ways that may be difficult to understand: a complex surgical procedure The question of who is legally responsible is a complex issue.
complexity
noun [C/U] us   /kəmˈplek·sɪ·t̬i/
[U] You must understand the variety and complexity of tasks assigned to the police.

complexnoun [C]

us   /ˈkɑm·pleks/
  • complex noun [C] (BUILDING)

a group of buildings that are related, or a large building having different parts: an apartment complex for elderly people
  • complex noun [C] (ATTITUDES)

a group of attitudes and feelings that influence a person’s behavior, often in a negative way: an inferiority complex
(Definition of complex from the Cambridge Academic Content Dictionary © Cambridge University Press)
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