2 definitions found From WordNet (r) 2.0 [wn]: thereon adverb: on that; "text and commentary thereon" [syn: {on it}, {on that}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Thereon \There*on"\, adverb [AS. ??ron. See {There}, and {On}.] On that or this. --Chaucer. Then the king said, Hang him thereon. --Esther vii. 9.

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