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complex

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adjective British English pronunciation: complex /ˈkɒmpleks/ British English pronunciation: complex /kəmˈpleks/
  1. 1
    something that is complex has a lot of details or small parts that make it difficult to understand or deal with

    the complex web of relationships between the two families

    This was a complex and difficult task.

    highly complex:

    These rules are highly complex.

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