com·plex

/ˌkämˈpleks,kəmˈpleks,ˈkämˌpleks/
adjective: complex

  1. consisting of many different and connected parts.
    • ot easy to analyze or understand; complicated or intricate.
  2. Mathematics
    denoting or involving numbers or quantities containing both a real and an imaginary part.
  3. Chemistry
    denoting an ion or molecule in which one or more groups are linked to a metal atom by coordinate bonds.

noun: complex
plural noun: complexes
/ˈkämpleks/

  1. a group of similar buildings or facilities on the same site.
    • a group or system of different things that are linked in a close or complicated way; a network.
  2. Psychoanalysis
    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.

    • informal
      a disproportionate concern or anxiety about something.
  3. Chemistry
    an ion or molecule in which one or more groups are linked to a metal atom by coordinate bonds.
    • any loosely bonded species formed by the association of two molecules.
  4. informal
    a disproportionate concern or anxiety about something.

verb Chemistry
verb: complex
3rd person present: complexes
past tense: complexed
past participle: complexed
gerund or present participle: complexing
/ˈkämpleks/

make (an atom or compound) form a complex with another.

Origin

Origin of complex

mid 17th century (in the sense ‘group of related elements’): from Latin complexus, past participle (used as a noun) of complectere ‘embrace, comprise’, later associated with complexus ‘plaited’; the adjective is partly via French complexe.