A list of discrete entities, such as hosts, email addresses, network port numbers, runtime processes, or applications, that have been previously determined to be associated with malicious activity. 
Sources:
CNSSI 4009-2015 from NIST SP 800-94

  List of words that have been pre-defined as being unacceptable for transmission and may be used in conjunction with a clean word list to avoid false negatives (e.g., secret within secretary).
Sources:
CNSSI 4009-2015 under dirty word list

  A list of discrete entities that have been previously determined to be associated with malicious activity.
Sources:
NIST SP 800-167

  A list of discrete entities, such as hosts or applications that have been previously determined to be associated with malicious activity.
Sources:
NISTIR 7621 Rev. 1 under Blacklist from CNSSI 4009-2015, NIST SP 800-94