Definition of special interest group noun from the Oxford Advanced American Dictionary

 

special interest group

 noun
noun
 
(also special interest)
 
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a group of people who work together to achieve something that they are particularly interested in, especially by putting pressure on the government, etc. The president has pledged to stand up to powerful special interest groups such as the gun lobby and the tobacco industry.
See the Oxford Advanced Learner's Dictionary entry: special interest group