Museum foyer là gì

Joined: 3/24/2017
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Hello respected teachers,

What does proper mean in the following please?

When the students come into the museum foyer we ask them to check in their backpacks with their books, lunch boxes, etc at the cloakroom before they enter the museum proper.

I consulted my dictionary but with no avail!

Joined: 12/16/2014
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Location: Detroit, Michigan, United States

From Merriam-Webster: strictly limited to a specified thing, place, or idea ·the city proper

Joined: 9/21/2009
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Location: Helsinki, Southern Finland Province, Finland

When they enter the museum, they might at first be in the entrance hall. They are asked to leave their backpacks before entering the museums actual exhibition rooms, the museum proper.