See also: Anonymization, De-identify

CIMM DEFINITION: Information that reveals the identity of an individual subscriber, either alone or in combination with other information.

2: “Any piece of information which can be used independently or with other sources to uniquely identify an individual.” (Source: Nielsen)

3: “Any information about an individual maintained by an agency, including (1) any information that can be used to distinguish or trace an individual’s identity, such as name, social security number, date and place of birth, mother’s maiden name, or biometric records and (2) any other information that is linked or linkable to an individual such as medical, educational, financial and employment information.” (Source: NIST, Guide to Protecting the Confidentiality of PII)

4: Refers to information such as an individual‘s name, mailing address, phone number or e-mail address. (Source: IAB)