noun

1. An unexpected event with negative consequences occurring without the intention of the one suffering the consequences.

   "to die by an accident"

2. Especially, a collision or similar unintended event that causes damage or death.

   "My insurance went up after the second accident in three months."

3. Any chance event.

4. Chance.

5. Any property, fact, or relation that is the result of chance or is nonessential.

   "Beauty is an accident."

6. An instance of incontinence.

7. An unintended pregnancy.

8. A quality or attribute in distinction from the substance, as sweetness, softness.

9. (grammar) A property attached to a word, but not essential to it, such as gender, number, or case.

10. An irregular surface feature with no apparent cause.

11. A sudden discontinuity of ground such as fault of great thickness, bed or lentil of unstable ground.

12. A point or mark which may be retained or omitted in a coat of arms.

13. Casus; such unforeseen, extraordinary, extraneous interference as is out of the range of ordinary calculation.

14. Appearance, manifestation.