Definition from Wiktionary, the free dictionary
- Rhymes: -ɒbi
Etymology 1 
lobby (plural lobbies)
- An entryway or reception area; vestibule; passageway; corridor.
- I had to wait in the lobby for hours before seeing the doctor.
- A class or group of people who try to lobby or influence public officials; collectively, lobbyists.
- The influence of the tobacco lobby has decreased considerably in the US.
- (video games) A virtual area where players can chat and find opponents for a game.
Derived terms 
entryway or waiting area; vestibule
group of people who try to lobby
- (intransitive, transitive) To attempt to influence (a public official or decision-maker) in favor of a specific opinion or cause.
- For years, pro-life groups have continued to lobby hard for restrictions on abortion.
- The corporations don't have to lobby the government anymore. They are the government. -- Jim Hightower
- 2012 April 15, Phil McNulty, “Tottenham 1-5 Chelsea”, BBC:
- The referee seemed well placed to award the goal, but video evidence suggested the protests were well founded and the incident only strengthens the case of those lobbying for technology to assist officials.
To attempt to influence
Related terms 
Etymology 2 
- lobby in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- lobby in The Century Dictionary, The Century Co., New York, 1911
- lobby at OneLook Dictionary Search
- lobby (hall, group of people)
lobby f (invariable)
- lobby (group of people; hall of a bank)