a group of similar buildings or facilities on the same site

a leisure complex

a complex of hotels

a related group of emotionally significant ideas that are completely or partly repressed and cause psychological conflict that affects mental states or behaviour

an ion or molecule in which one or more groups are linked to a metal atom by coordinate bonds

two guanine bases can attach themselves to the same platinum atom, forming a stable complex

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

the DNA was complexed with the nuclear extract