An accident at work is defined as an external, sudden, unexpected, unintended, and violent event, during the execution of work or arising out of it, which causes damage to the health of or loss of the life of the employee. In worst cases, it causes occupational fatality.
http://en.wikipedia.org/wiki/Work_accident*
http://quizilla.teennick.com/stories/16333255/work-accident-common-injuries-in-the-workplace