Etymology

thereon

T1H4E1R1E1O1N1

Today it means: On that: on (top of) it. Full definition →

Old English þǣron
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The story

  1. Old English · inherited fromþǣron
  2. English todaythereon

From Old English þǣron, equivalent to there + on.

Etymology from Wiktionary, CC BY-SA 4.0.