Lobby (noun)

1. A room in a public building leading to other parts, especially one near the entrance.
2. An entrance hall or vestibule in a public building.
3. A group of people who come together to achieve a particular aim, especially political or commercial.

Origin:

Early 17th century: from obsolete lob "to clap, a hem", from dutch lobbe "a large cloak".

Examples:

1. He was waiting for her in the hotel lobby.
2. The museum's lobby was filled with visitors admiring the art exhibit.
3. An environmental lobby is pressing the government to take action on climate change.
4. The powerful oil lobby has been able to influence government policies.
5. The lobby of the building was undergoing renovation work.