Incident
This can be either a near miss, which is an event not causing harm, but has the potential to cause injury or ill health, and in which the HSE typically will include dangerous occurrences; or an undesired circumstance, which is set of conditions or circumstances that have the potential to cause injury or ill health. (https://www.hse.gov.uk/toolbox/managing/accidents.htm)
Schedule 2 of RIDDOR identifies dangerous occurrence events, which are known as a reportable incidence. (https://www.legislation.gov.uk/uksi/2013/1471/schedule/2/made )
The difference between an incident and an accident is that an incident does not result in personal injury, whilst for an accident there is some form of personal injury incurred.