From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Ἔτι (Strong'S #2089 — Adverb — eti — et'-ee )

"yet, still, further," is rendered "thenceforth" in  Matthew 5:13 .

 Luke 13:9 John 19:12

King James Dictionary [2]

Thenceforth adv. thens'forth. thence and forth. From that time.

If the salt hath lost its savor, it is thenceforth good for nothing.  Matthew 5 .

This is also preceded by from, though not from any necessity.

And from thenceforth Pilate sought to release him.  John 19 .

Webster's Dictionary [3]

(adv.) From that time; thereafter.