From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. (Arch.) A passage or hall of communication, especially when large enough to serve also as a waiting room. It differs from an antechamber in that a lobby communicates between several rooms, an antechamber to one only; but this distinction is not carefully preserved.
2. That part of a hall of legislation not appropriated to the official use of the assembly; hence, the persons, collectively, who frequent such a place to transact business with the legislators; hence: any persons, not members of a legislative body, who strive to influence its proceedings by personal agency; a group of lobbyists for a particular cause; as, the drug industry lobby. [U. S.] [1913 Webster +PJC]
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