Injuries that are not accidental but which are instead caused on purpose or with intent. An intentional injury may be excluded from coverage under some types of health insurance policies. For example, an accident insurance policy will likely not cover intentional injuries because they are not "accidental."
An injury resulting from an act, the doer of which had as his intent, inflicting injury. In an accident insurance contract, an intentionally self-inflicted injury is not covered (because it is not an accident). In general, intentional injuries inflicted on the insured are covered (assuming no collusion).