noun.
Unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups; junk e-mail.
noun.
A single piece of such e-mail.
transitive verb.
To send unsolicited e-mail to.
transitive verb.
To send (a message) indiscriminately to multiple mailing lists, individuals, or newsgroups.