Meaning of whereupon

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. upon what?
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.