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Definition of complex
1consisting of many different and connected parts:a complex network of water channels not easy to analyze or understand; complicated or intricate:a complex personality the situation is more complex than it appears 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.
1a group of similar buildings or facilities on the same site:a new apartment complex a complex of hotels a group or system of different things that are linked in a close or complicated way; a network:a complex of mountain roads 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:there’s no point having a complex about losing your hair 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:cross-linked protein-DNA complexes
[with object] (usually be complexed) Chemistry
make (an atom or compound) form a complex with another:the DNA was complexed with the nuclear extract (as adjective complexed)the complexed metal ion