Henceforth means from this moment on. Henceforth known as, henceforth all applications, henceforth it shall be.
It belongs to notices, contracts and proclamations, and using it in speech is a joke about ninety per cent of the time. Henceforward is the longer variant. Note hence, which means from here or from now and also therefore; and thence, meaning from there — a small family of words that legal drafting has kept alive long after ordinary speech let them go.
1adverbhenceforthFrom this moment on.
“Henceforth, all visitors must sign in at the front desk.”
henceforth is an adverb of time.
Middle English hennes forth is hence plus forth, from Old English heonan, from here. Hence, thence and whence were all built with the same adverbial -s.
Old English
heonan forþ
Middle English
hennes forth
English, today
henceforth
From Middle English hennes forth, hens-forþ, hennes-forþ, from modification of Old English heonan forþ with an adverbial genitive suffix. by surface analysis, en + hence + forth.
Etymology from Wiktionary, CC BY-SA