Accident

1. n. Unusual appearance or effect.
2. n. Literally, a befalling; an event that takes place without one’s foresight or expectation; an undesigned, sudden, and unexpected event; chance; contingency; often, an undesigned and unforeseen occurrence of an afflictive or unfortunate character; a casualty; a mishap; as, to die by an accident.
3. n. A property attached to a word, but not essential to it, as gender, number, case.
4. n. A point or mark which may be retained or omitted in a coat of arms.
5. n. A property or quality of a thing which is not essential to it, as whiteness in paper; an attribute.
6. n. A quality or attribute in distinction from the substance, as sweetness, softness.
7. n. Any accidental property, fact, or relation; an accidental or nonessential; as, beauty is an accident.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.