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What does EM stand for?

EM stands for Express Mail

This definition appears very rarely

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We have 70 other meanings of EM in our Acronym Attic

Samples in periodicals archive:

Express Mail Express Mail is the Post Office's fastest service with next day delivery by 12 noon to most destinations.
You can use this Internet postage service to buy stamps for first-class, priority and express mail, all from the comfort of your home or office.