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English definition of “surface mail”

surface mail

noun [U]    
COMMUNICATIONS, TRANSPORT the service in which letters, packages, etc., are sent by road, ship, or train, rather than by plane, or mail that is sent in this way: send sth (by) surface mail I sent the package by surface mail. Surface mail takes much longer to arrive. → Compare airmail
(Definition of surface mail noun from the Cambridge Business English Dictionary © Cambridge University Press)
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