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

 

populous

 adjective
adjective
BrE BrE//ˈpɒpjələs//
 
; NAmE NAmE//ˈpɑːpjələs//
 
(formal)
 
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where a large number of people live one of America’s most populous states the populous coastal region Word Origin late Middle English: from late Latin populosus, from populus ‘people’.
See the Oxford Advanced American Dictionary entry: populous