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A portal of entry into a building, room, or vehicle, typically consisting of a rigid plane movable on a hinge. It may have a handle to help open and close, a latch to hold it closed, and a lock that ensures it cannot be opened without a key.
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(metonymic, chiefly in the plural) A building with a door, especially a house.
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Any flap, etc. that opens like a door.
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(immigration) An entry point.
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(figurative) A means of approach or access.
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(figurative) A possibility.
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(figurative) A barrier.
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(computing, dated) A software mechanism by which a user can interact with a program running remotely on a bulletin board system. See BBS door.
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The proceeds from entrance fees and/or ticket sales at a venue such as a bar or nightclub, especially in relation to portion paid to the entertainers.