Definition of subgroup noun from the Oxford Advanced Learner's Dictionary

 

subgroup

 noun
noun
BrE BrE//ˈsʌbɡruːp//
 
; NAmE NAmE//ˈsʌbɡruːp//
 
 
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a smaller group made up of members of a larger group population subgroups
See the Oxford Advanced American Dictionary entry: subgroup