An uncertain event or condition that, if it occurs, has a positive or negative effect on a project's objectives. [ IEEE 1490 ]
Risk [ IEEE 829 ]: The combination of the probability of an abnormal event or failure and the consequence(s) of that event or failure to a system's components, operators, users, or environment.
Risk [ ISO/IEC 15026 ]: A function of the probability of occurrence of a given threat and the potential adverse consequences of that threat's occurrence.
Risk [ IEEE 829 ]: The combination of the probability of occurrence and the consequences of a given future undesirable event.