Etymology

whereupon

where·upon
W4H4E1R1E1U1P3O1N1

Today it means: After which; in consequence; at which point. Full definition →

Middle English wherupon
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The story

  1. Middle English · inherited fromwherupon
  2. English todaywhereupon

From Middle English wherupon; equivalent to where- + upon.

Etymology from Wiktionary, CC BY-SA 4.0.