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The term "hitherto valid" is correct and usable in written English.
You can use it when talking about something that is still valid, in spite of changes that may have occurred. Example: The law, hitherto valid, was amended to reflect the changing times.
Exact(1)
Thus, these trials stressed the extinction phase of reversal learning (abandonment of the hitherto valid cue), while they did not show the stimulus with which the reward association had to be established in the next trial.
Similar(56)
It allows for the design of more ecologically valid experimental paradigms and the investigation of questions that were hitherto very difficult to answer conclusively, and it also addresses the practical issue that certain attention experiments carried out using functional magnetic resonance imaging (fMRI) have not been replicable in ERP designs.
Notwithstanding the above difficulties in retrieving valid data from chart reviews in an institutionalized geriatric population, this study provides hitherto unreported information to inform future studies on back pain in this population.
Hitherto insipid, Arsenal awoke.
From the stylebook: heretofore, hitherto.
Diplomacy, hitherto fruitless, is intensifying.
Valid question.
Hitherto, the EU did not formally exist.
Most were hitherto dormant Socialist supporters.
Hitherto, what happened was this.
That is still valid – flawed, but valid".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com