Casually, accidentally, as in I ran into Bill purely by chance. [c. 1300] Also see by coincidence.
Words nearby by chance
How to use by chance in a sentence
With chemotherapy, her doctors give her at least an 80 percent chance of survival.
At the moment, the only chance I get is when I go do Late Night with Seth Meyers.Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
Is there any chance the potential 2016 hopeful will stand up to the right and embrace paid sick leave?
Do those things," he said, "and you'll have half a chance of being successful.
A step-by-step plan to break from your various technology addictions.
If you throw away this chance, you will both richly deserve to be hanged, as I sincerely trust you will be.The Posthumous Papers of the Pickwick Club, v. 2(of 2)|Charles Dickens
All along the highways and by-paths of our literature we encounter much that pertains to this "queen of plants."
John was baptizing at a large pool called Ænon-by-Saleim,—probably allegorical, meaning “Fountain of Repose.”Solomon and Solomonic Literature|Moncure Daniel Conway
Instead of giving you a chance to say, "He has made a mistake," he forced you to say, "He has shown how to get out of a mistake."Music-Study in Germany|Amy Fay
The sewing-machine made a resounding clatter in the room; it was of a ponderous, by-gone make.The Awakening and Selected Short Stories|Kate Chopin