henceforth
adv. timeadv. from this time forward. You use this in formal writing to say that a new rule or situation starts now and will continue in the future.
adv. from this time on or from this point forward. Typically used in legal, official, or highly formal contexts to establish a new state of affairs.
Henceforth, all employees must wear ID badges.
The company announced that henceforth all internal communications will be conducted via the new encrypted platform.
The treaty stipulated that henceforth the disputed territory would be recognized as a neutral zone, governed by an international committee rather than either neighboring state.
From Middle English hennes forth, hens-forþ, hennes-forþ, from modification of Old English heonan forþ with an adverbial genitive suffix. By surface analysis, hence (“from here”) + forth (“forward”).
Sentence-modifying adverb; often placed at the beginning of a clause or immediately after the subject in formal documents.
I will henceforth to study harderI will henceforth study harderHenceforth is an adverb, not a verb; it modifies the action but does not replace the infinitive marker 'to'.