zì​cǐ

thereafter

自此 zì​cǐ
thereafter adverb
from a specific point in the past onwards

Since then, he has never mentioned that matter again.

henceforth adverb
from this point forward into the future

Now that the agreement has been signed, both sides will maintain peace henceforth.

Frequency

Movie subtitles
0.390 per million appears in 0% of films
Written text
3.95 per million

Sources

Definitions
CC-CEDICT