Accident (noun)

1. An event that happens by chance or that is without apparent or deliberate cause.
2. An unfortunate event that happens unexpectedly and unintentionally.
3. An event resulting in injury or damage.
4. A crash or collision involving a vehicle.
5. A mishap or unexpected event.

Origin:

Late middle english: from old french, or from latin accident- "happening", from the verb accidere, from ad- "to" + cadere "fall".

Examples:

1. The accident was caused by driver error.
2. He had an accident on his way to work.
3. She was in a serious accident and had to be hospitalized.
4. The accident caused a traffic jam on the highway.
5. The company had an accident at the plant.