From SKYbrary Wiki
When the wheels of an aircraft on the runway surface depart the end or the side of the runway surface.
"A veer off or overrun off the runway surface." (ICAO)
Runway excursions can occur on takeoff or on landing. They consist of two types of events:
Articles with knowledge related to Runway Excursions are arranged within the following sub-categories - click on the icons to view the full list of articles. Because of their nature, some articles are listed in more than one sub-category...
Research and Statistics
Checklists & Toolkits
Accident and Serious Incident Reports
European Action Plan for the Prevention of Runway Excursions
For a fuller overview of this issue, see the article: Runway Excursion.