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English definition of “complex”

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complex

adjective  /kəmˈpleks, ˈkɑm·pleks/ us  
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]  /kəmˈplek·sɪ·t̬i/ us  
[U] You must understand the variety and complexity of tasks assigned to the police.
(Definition of complex adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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