Definition of subordinate clause noun from the Oxford Advanced Learner's Dictionary

 

subordinate clause

 noun
noun
BrE
 
; NAmE
 
(also dependent clause)(grammar)
 
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a group of words that is not a sentence but adds information to the main part of a sentence, for example when it rang in She answered the phone when it rang. compare coordinate clause, main clause
See the Oxford Advanced American Dictionary entry: subordinate clause