1. (adverb)
by chance, accidentally, circumstantially, unexpectedly
- without advance planning Synonyms: by luck, incidentally, unintentionally, accidentally, circumstantially, perchance, by chance, unexpectedly, out of the blue, haply, minutely
2. (adverb)
incidentally, accidentally
- of a minor or subordinate nature Synonyms: incidentally, unintentionally, by the bye, by chance, accidentally, circumstantially, apropos, by the way, unexpectedly
3. (adverb)
unintentionally, accidentally
- without intention; in an unintentional manner Synonyms: by chance, unexpectedly, circumstantially, incidentally, unintentionally, accidentally