Definition of by accident
: in a way that is not planned or intended : by chance <They met by accident.> <She says that she became pregnant by accident.> <Scientists discovered the vaccine almost/quite/entirely by accident.>
Word by Word Definitions
: an unforeseen and unplanned event or circumstance
: lack of intention or necessity : chance
: an unfortunate event resulting especially from carelessness or ignorance
Seen and Heard
What made you want to look up by accident? Please tell us where you read or heard it (including the quote, if possible).