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noun [countable] complex pronunciation in American English /ˈkɑmˌpleks/ 
Word Forms
  1. 1
    a group of buildings together, or a building that has several parts

    I just moved into a new apartment complex.

    Synonyms and related words for this sense of complex
  2. 2
    an emotional problem caused by unreasonable fears or worries
    have/develop a complex about something:

    I used to have a complex about being in crowds.

    give someone a complex:

    If you keep telling her she's clumsy, you'll give her a complex.

  3. 3
    formal a large number of things together, especially when they are difficult or confusing
    complex of:

    the complex of delicate wiring


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