whereupon
conj.conj. immediately after which something else happens. You use this to connect two parts of a sentence when one action causes or leads directly to the next.
conj. immediately following which; used to introduce a clause describing a consequence or a subsequent action. Functions as a relative adverb or subordinating conjunction in formal narrative contexts.
He finished his speech, whereupon the audience began to clap.
The witness finished her testimony, whereupon the judge called for a brief recess before the cross-examination began.
The CEO announced the unexpected merger to the board, whereupon several members immediately resigned in protest of the new corporate direction.
From Middle English wherupon; equivalent to where- + upon.
Used to join two clauses where the second event follows the first in time or as a result. Primarily found in formal writing or legal documents.