Archaic or dialectal form meaning 'along' or 'in progression,' now rarely used.
From Old English 'on long,' where 'on' means 'in' and 'long' refers to duration or distance; contracted into a single word over time.
English had words like 'amlong' that we've since replaced with simpler equivalents—'along'—showing how language naturally smooths and shortens its vocabulary over centuries.
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