thereon

Thereon means on the thing that was just mentioned, as in The cap should be positioned above the container before being placed thereon (translation: The cap should be positioned above the container before being placed on it).

Thereon is formal and is often used in legal language.

It can also mean immediately after the thing just mentioned, as in When the jury is assembled, the trial should proceed thereon.

The word thereupon can be used as a synonym for both senses of thereon.

Example: The book is about the introduction of the printing press in Europe and the effects thereon.

The first records of the word thereon come from before 900.

There are many similar words based on the combination of the word there and a preposition, each of which has a different meaning, including thereabout, thereabouts, thereafter, thereat, thereby, therefor, therefore, therefrom, therein, thereinafter, thereinto, thereof, theretofore, thereunder, thereupon, therewith, and therewithal.

Other words are constructed in similar ways, such as whereon, meaning “on what or which,” as in the surface whereon it was placed (translation: the surface on which it was placed or the surface it was placed on).

What are some synonyms for thereon?

• thereupon

What are some words that share a root or word element with thereon? 

• thereabout
• thereabouts
• thereafter
• thereat
• thereby
• therefor
• therefore
• therein
• thereinafter
• thereinto
• thereof
• thereto
• theretofore
• thereunder
• therewith
• therewithal
• whereon

What are some words that often get used in discussing thereon?

• effects
• impact
• placed

Thereon is formal and is often used in legal language.

[L]et a day be solemnly set apart for proclaiming the charter; let it be brought forth placed on the divine law, the Word of God; let a crown be placed thereon, by which the world may know, that so far as we approve of monarchy, that in America the law is king – Thomas Paine 1776

— Harvey J Kaye (@harveyjkaye) February 11, 2021

#TaxTip Make sure you know the difference between occupancy and running costs for your business and the tax effects thereon.

— Janna Fikh (@FletcherTax) July 11, 2010

@NYmoderate Hard to find scientific articles in peer reviewed journals that don't support climate change and man's impact thereon.

— Ned Witting (@nedwitting) May 12, 2014

Is thereon used correctly in the following sentence?

After the guests are seated, the ceremony will commence thereon.