Definition: lobbyist

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Source: WordNet (r) 1.7 

lobbyist
     n : someone who tries to persuade legislators to vote for bills
         that the lobbyists favor

Source: Webster's Revised Unabridged Dictionary (1913) 

Lobbyist \Lob"by*ist\, n.
   A member of the lobby; a person who solicits members of a
   legislature for the purpose of influencing legislation.
   [U.S.]