thereon
adverb
there·on t͟her-ˈȯn 
-ˈän
1
: on that
a text with a commentary thereon
2
archaic : thereupon
Example Sentences
The highway and structures thereon are being repaired. a text with a commentary thereon
Recent Examples on the Web The All-Stars controlled the game from thereon in, with Michael Carrick and Jamie Carragher in keeping hold of the ball well alongside Manchester United legend Paul Scholes. 
SI.com, 11 Sep. 2019 No person having control or charge of a motor vehicle shall allow such vehicle to stand on any public highway unattended without first effectively setting the brakes thereon and stopping the motor of said vehicle. Nashelly Chavez, sacbee, 14 May 2018 Riot Fest tickets subject to terms and conditions thereon9) Other Conditions: The Contest judges will make all final decisions in any and all issues related to this Contest, and their decisions will be final and binding in all respects. RedEye Chicago, 2 Aug. 2017 His writing on Fawlty Towers and his portrayal of Basil Fawlty thereon were so hysterical that, despite having lasted for only twelve episodes, it is thought of by many as the best sitcom ever made. Matt Blum, WIRED, 27 Oct. 2012
SI.com, 11 Sep. 2019 No person having control or charge of a motor vehicle shall allow such vehicle to stand on any public highway unattended without first effectively setting the brakes thereon and stopping the motor of said vehicle. Nashelly Chavez, sacbee, 14 May 2018 Riot Fest tickets subject to terms and conditions thereon9) Other Conditions: The Contest judges will make all final decisions in any and all issues related to this Contest, and their decisions will be final and binding in all respects. RedEye Chicago, 2 Aug. 2017 His writing on Fawlty Towers and his portrayal of Basil Fawlty thereon were so hysterical that, despite having lasted for only twelve episodes, it is thought of by many as the best sitcom ever made. Matt Blum, WIRED, 27 Oct. 2012 Word History
First Known Use
before the 12th century, in the meaning defined at sense 1
Kids Definition
thereon
adverb
there·on t͟her-ˈȯn
-ˈän
: on that
The road and the signs thereon.