Definition of "lobby"

noun:
- An entryway or reception area; vestibule; passageway; corridor.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- A class or group of people who try to lobby or influence public officials; collectively, lobbyists.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- A virtual area where players can chat and find opponents for a game.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- Scouse (from lobscouse).
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To attempt to influence (a public official or decision-maker) in favor of a specific opinion or cause.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License