megacomplex adjective 1noun 1forms 3 adjective1 •Very complex noun1 •A very large complex of buildings[…] he has remade the city’s skyline with half a dozen high-rises, including a $4 billion megacomplex over 27 acres, Roppongi Hills. — 2008 formsmegacomplexes · more megacomplex · most megacomplex