Meaning of “complex” in the English Dictionary

"complex" in 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 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.

More examples

complexnoun [ C ]

uk /ˈkɒm.pleks/ us /ˈkɑːm.pleks/

(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:

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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complex

The export refund system is extremely complex and highly open to fraud, as it does not follow the most elementary rules of transparency.
I suggest to you that this wording and much of the wording here is not only complex, difficult and opaque but actually goes in entirely the wrong direction.
They operate in a complex manner and sometimes their decisions oblige us to take one route or another in a way that to a certain extent predetermines the result.
The subject is a complex one.
We know that security is a difficult and complex task, encompassing all sorts of issues like availability, integrity, authenticity and confidentiality of data and services.
The prevention and control of trafficking in human organs is a very complex issue, both ethically and technically, and requires careful consideration and debate.
The combination of environmental concerns, economic interests and governmental reluctance makes this a complex task, but we have been relatively successful in this case.
A very complex institutional structure is, by definition, not secular but conceived for the priests of bureaucracy that control everyday life: life that cannot be controlled and cannot function.
I would also like to thank them for their particular dedication to an issue which is very complex from a technical and institutional point of view.
Overall, the approach is too academic and takes little account of the practical difficulties of implementing the approach at industrial sites - some of which can be extremely complex.

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