(hwer′ ə pän′, wer′-; hwer′ə pän′, wer′-)
- Archaic upon which: the ground whereupon he had fallen
- at which; upon which; as a consequence of which: she told a tale, whereupon he laughed heartily
See whereupon in American Heritage Dictionary 4
- On which.
- In close consequence of which: The instructor entered the room, whereupon we got to our feet.
Learn more about whereupon