An alternative form of henceforward, meaning from this time forward.
Variant of 'henceforward' with an added '-s', similar to how 'backwards' and 'backward' both exist. This reflects Middle English and Early Modern English flexibility in directional adverbs.
Many English adverbs can take an optional 's' at the end—'afterwards' and 'afterward' are both correct, showing that English used to be much more flexible about word endings before modern standardization locked things down.
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