formal
: at which time
—used to say that something happens directly after something else and often as a result of it
He graduated from high school in 1986, whereupon he immediately joined the navy.
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“Whereupon.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/whereupon. Accessed 21 Jun. 2026.
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