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

 

lobbyist

 noun
noun
BrE BrE//ˈlɒbiɪst//
 
; NAmE NAmE//ˈlɑːbiɪst//
 
 
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a person whose job involves trying to influence politicians or the government and, for example, persuade them to support or oppose a change in the law political lobbyists lobbyist for something a lobbyist for the oil industry
See the Oxford Advanced American Dictionary entry: lobbyist