e-mail

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Associated Press style guide collapsed it to email 2011.

n.

a type of pottery design pattern, c.1877, from French email (12c.), literally “enamel” (see enamel (n.)).

1. A system for sending and receiving messages electronically over a computer network. E-mail is asynchronous and does not require the receiver of the message to be online at the time the message is sent or received. E-mail also allows a user to distribute messages to large numbers of recipients instantaneously.
2. A message or messages sent or received by such a system.

E-mail has become one of the most widely used aspects of the Internet, because it provides a means of mass communication to almost anywhere in the world at high speed.