the state of being whole and undivided. (Oxford Online Dictionary 2016)
 Degree to which a system or component prevents unauthorized access to, or modification of, computer programs or data. (ISO/IEC 2011)
 Oxford On-line Dictionary (2016)
ISO/IEC. 2011. Systems and Software Engineering - Systems and Software Quality Requirements and Evaluation (SQuaRE) - Systems and Software Quality Models. Geneva, Switzerland: International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC). ISO/IEC 25010:2011.
In a resilience context integrity is an attribute of a system before, during and after an encounter with a threat.