From this or that time on.
Usually used by 12 year olds to sound more educated when writing an essay for school.
Henceforth, parties which fail to get 5% of the vote will not be represented in parliament.
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From this time on or from that time on.
The company announced that it would henceforth charge royalties
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The smartest way of saying "I can't/I cannot"
"The way I would write I can't in an essay? 'Henceforth I am unable to can'"