Definition of complex adjective from the Oxford Advanced Learner's Dictionary

Oxford3000 Academic

complex

adjective
 
ˈkɒmpleks
 
; kəmˈpleks
 
; ˈkɑːmpleks
 
1 made of many different things or parts that are connected; difficult to understand
Synonym
complicated
complex machinerythe complex structure of the human braina complex road systema complex argument/problem/subject
2 (grammar) (of a word or sentence) containing one main part (= the root of a word or main clause of a sentence) and one or more other parts (called affixes or subordinate clauses)In the complex sentence, ‘I'd like to go the beach, if it's warm enough’, ‘I'd like to go to the beach’ is the main clause, and ‘if it's warm enough’ is the subordinate clause. compare compound adjective