At the same time; also soon, indicating something happening quickly alongside another event.
From Old English 'al' (all) + 'sona' (soon), combining two temporal concepts into a single archaic adverb used in Middle English texts to express simultaneous quick occurrence.
This word is nearly extinct from English, surviving mainly in historical manuscripts and early poetry—it's like finding a linguistic fossil that shows how speakers once combined 'all' and 'soon' into one word before modern English decided to keep them separate.
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