This context comes from the video game "Divinity Original Sin II" It's a fragment of a letter I found in the game:


Certain Sourcerers known as 'Godwoken' are to be identified upon the agreement of both parties to the terms of this contract. These 'Godwoken' will be located by the contractor and disposed of in a timely, quiet, and seemly manner."


a. Used to indicate a source or basis: "We will reach our judgments not on intentions or on promises but on deeds and on results" (Margaret Thatcher). (source: American Heritage® Dictionary of the English Language)

Is this the correct definition?

1 Answer 1


Upon does mean on, but not always in the sense of "using as a basis". If you look at the examples in Merriam-Webster, you will see one like

  • She was admitted to his office immediately upon her arrival.

which is the same usage as in your question. If you look at the definition of on, you will find

3 — used as a function word to indicate a time frame during which something takes place or an instant, action, or occurrence when something begins or is done : on arriving home, I found your letter

I would interpret upon in your example the same way: "...will be identified when both parties have agreed to this contract", not "because both parties agree" or "on the basis of agreement to this contract".

  • Yeah, it made sense as soon as I read your answer. Thanks:) Sep 21, 2022 at 12:55

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