Thereon/ˌðerˈɑːn/ Definition 1 of 2Pro Tip 1/3Physical Placement Refers to putting something on top of what was mentioned earlier. He put a card on the table, then a pin thereon. Pro Tip 2/3Emphasis on Location Used to emphasize the specific place previously mentioned. You must stand by the gate, not anywhere else, but exactly thereon. Pro Tip 3/3Literary Usage Often found in formal or literary contexts, not in everyday conversation. Upon the ancient scroll was a seal, and thereon, the king's mark.