Email (noun)

1. A system for sending messages from one individual to one or more recipients via a network.
2. A message sent or received in such a system.
3. An electronic message sent or received via the internet.
4. A message sent or received via electronic mail.
5. An electronic message sent or received through a computer network.

Origin:

Short for electronic mail, coined in the 1970s.

Examples:

1. He sent her an email.
2. I received an email from my boss.
3. She replied to the email.
4. I need to check my email.
5. He sent the email to the wrong person.