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spam

Definitions:

  Electronic junk mail or the abuse of electronic messaging systems to indiscriminately send unsolicited bulk messages.
Sources:
CNSSI 4009-2015
NIST SP 800-12 Rev. 1 under Spam from CNSSI 4009
NISTIR 7621 Rev. 1 under Spam from CNSSI 4009-2015

  Unsolicited bulk commercial email messages.
Sources:
NIST SP 800-45 Version 2 under Spam

  The abuse of electronic messaging systems to indiscriminately send unsolicited bulk messages.
Sources:
NIST SP 800-53 Rev. 5