Definition of advocacy group noun from the Oxford Advanced Learner's Dictionary

 

advocacy group

 noun
noun
BrE
 
; NAmE
 
(North American English)
 
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a group of people who work together to achieve something, especially by putting pressure on the government, etc., usually on behalf of people who are unable to speak for themselves an advocacy group for the rights of the mentally ill compare interest group, pressure group
See the Oxford Advanced American Dictionary entry: advocacy group