Etymology
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henceforth (adv.)

late 14c., earlier henne forth (late Old English); see hence + forth.

updated on March 20, 2013

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Definitions of henceforth from WordNet

henceforth (adv.)
from this time forth; from now on;
henceforth she will be known as Mrs. Smith
Synonyms: henceforward
From wordnet.princeton.edu, not affiliated with etymonline.