Dictionary
where•up•on
Pronunciation: (hwâr"u-pon', -pôn', wâr"-;-hwâr'u-pon", -pôn", wâr'-), [key]—
conj.
1. upon what or upon which.
2. at or after which.
3. Archaic.upon what?
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.