What is special about a “communicating door”?

The other day I heard someone refer to a communicating door.

The OED does not have a specific entry for communicating door but the definition they give of the adjective communicating is affording communication.

Since all doors afford communication it leaves me puzzled, wondering what door could possibly not be a communicating door.

Does anyone see any legitimate value in the tern communicating door? And if so, what is it about them that is special?

One problem here is that being a composite term it does not appear in dictionaries and any Google or Wikipedia search is overwhelmed with information, pictures etc. from the play Communicating Doors by Alan Ayckbourn.

Answer

The essential feature of a communicating door is that it enables movement between two rooms without this movement being common knowledge. A communicating door allows privacy/secrecy.

Attribution
Source : Link , Question Author : WS2 , Answer Author : Dan

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