Attribute

An attribute is the following:

Generally, an attribute is an abstraction characteristic of an entity
In database management, an attribute is a property inherent in an entity or associated with that entity for database purposes.
In network management, an attribute is a property of a managed object that has a value.
In SGML-based markup languages like HTML and XML, an attribute is a parameter to a HTML element.

Sources

Federal Standard 1037C and from MIL-STD-188

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