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Information describing the characteristics of data including, for example, structural metadata describing data structures (e.g., data format, syntax, and semantics) and descriptive metadata describing data contents (e.g., information security labels).
CNSSI 4009-2015 NIST SP 800-53 Rev. 4
NIST SP 800-150 under Metadata NIST SP 800-53 Rev. 4
NIST SP 800-53 Rev. 4 under Metadata
Information used to describe specific characteristics, constraints, acceptable uses and parameters of another data item (e.g., a cryptographic key).
NIST SP 800-57 Part 1 Rev. 4 under Metadata
NIST SP 800-57 Part 1 Rev. 3 under Metadata [Superseded]
Data about data. For filesystems, metadata is data that provides information about a file’s contents.
NIST SP 800-86 under Metadata
The information associated with a key that describes its specific characteristics, constraints, acceptable uses, ownership, etc. Sometimes called the key's attributes.
NIST SP 800-57 Part 2 Rev.1 under Metadata