complex
/kɑmˈplɛks/ /Brit ˈk{scriptainv}mˌplɛks/
adjective
[more ~; most ~] :having parts that connect or go together in complicated ways
[more ~; most ~] :not easy to understand or explain :not simple
grammar :consisting of a main clause and one or more additional clauses
noun
plural -plexes
[count] a group of buildings, apartments, etc., that are located near each other and used for a particular purpose
an emotional problem that causes someone to think or worry too much about something
a group of things that are connected in complicated ways
US