'Thereon' definitions:

Definition of 'thereon'

From: WordNet
adverb
On that; "text and commentary thereon" [syn: thereon, on it, on that]

Definition of 'Thereon'

From: GCIDE
  • Thereon \There*on"\, adv. [AS. ??ron. See There, and On.] On that or this. --Chaucer. [1913 Webster]
  • Then the king said, Hang him thereon. --Esther vii. 9. [1913 Webster]