/ ˈpəʊstl; NAmE ˈpoʊstl/ adjective [ only before noun ]
1.
connected with the official system for sending and delivering letters, etc. :
your full postal address
the postal service / system
postal charges
2.
( especially BrE ) involving things that are sent by post :
postal bookings
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IDIOMS
- go postal
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WORD ORIGIN
mid 19th cent.: from French , from poste postal service.