complex,

US

UK

B2

adjective

  • Consisting of many different and connected parts.
  • Denoting or involving numbers or quantities containing both a real and an imaginary part.
  • Denoting an ion or molecule in which one or more groups are linked to a metal atom by coordinate bonds.
  • Make (an atom or compound) form a complex with another.

noun

  • A group of similar buildings or facilities on the same site.
  • A related group of emotionally significant ideas that are completely or partly repressed and that cause psychic conflict leading to abnormal mental states or behavior.
  • An ion or molecule in which one or more groups are linked to a metal atom by coordinate bonds.