Webster's Revised Unabridged Dictionary · 1913

Thenceforth

Thenceforth , adverb

From that time; thereafter.
If the salt have lost his savor, wherewith shall it be salted? it is thenceforth good for nothing. — Matt. v. 13

This word is sometimes preceded by from, -- a redundancy sanctioned by custom. Chaucer. John. xix. 12.