(PII) personally identifiable information definition

Definition of personally identifiable information : noun

1. Any data that could identify a specific individual. Personally identifiable information is commonly refered to by the acronym PII. In particular, PII includes data that can distinguish one person from another (and that can be used to de-anonymize other data). Examples of sensitive PII include biometric data, medical information, personal financial information, passport numbers, and Social Security numbers.