Identity

A set of attributes that uniquely describe a person within a given context.
SOURCE: SP 800-63

The set of physical and behavioral characteristics by which an individual is uniquely recognizable.
SOURCE: FIPS 201

The set of attribute values (i.e., characteristics) by which an entity is recognizable and that, within the scope of an identity manager’s responsibility, is sufficient to distinguish that entity from any other entity.
SOURCE: CNSSI-4009