at or to a greater distance; a larger amount of distance away.
From Middle English 'ferther,' a comparative form of 'far' from Old English 'feor.' It evolved as the comparative of 'far' alongside the newer 'further,' which has become more common in modern English.
English speakers created 'farther' as a more concrete way to say 'further'—but now we're slowly abandoning it and using 'further' for everything! In 100 years, 'farther' might be mostly gone.
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