Definitions

1. adverb

up to that point in time; hitherto

“She had been working on the project thitherto, but it was still incomplete.”

2. noun

a point in time up to which something has been the case

“The company’s record thitherto shows steady growth.”

3. conjunction

used to indicate that something has been the case up to a particular point in time

“The project had been successful thitherto, but it failed in the end.”