1. happening by chance or without being planned
2. not essential or inherent; incidental

1. a musical note that is not part of the key signature
Usage: music

Examples

• The fire was accidental, not arson.
• She made an accidental discovery while researching.
• His success was no accidental stroke of luck.
• The meeting was purely accidental.
• The pianist played the accidental perfectly.
• It was an accidental encounter at the store.
• The damage was accidental, not intentional.