thereon /ðɛəˈɹɒn/ adverb2 •On that: on (top of) it.Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon. And whoso shall swear by the temple, sweareth by it, and by him that dwelleth therein. — 1611 •About that: about it (concerning it, regarding it).
