Definitions from Wiktionary (by accident) ▸ adverb:Accidentally; unintentionally; without meaning to; as the result of an event not expected, aided, or willingly planned. ▸ adverb:As the result of some undesigned, unintended, unrelated, natural, or random occurrence; as the unexpected and unforeseen result of formerly unrelated factors. ▸ adverb:By chance; unexpectedly; as the result of an unrelated series of events. ▸ adjective:Accidental; as the result of some unforeseen happening or series of events; unexpected; resulting from an event without the foresight, expectation, aid, or design of the person by whose agency it was caused; unintentional.on accident, accidentally, unintentionally, undesignedly, nonintentionally, mistakenly, unaccidentally, incidentally, unplannedly, per accidens, more... ▸ Words similar to by accident ▸ Usage examples for by accident