"Farther" Or "Further"?
She moved further down the train.
She moved farther down the train.
Both words share the same roots: in the sentences given above, where the sense is ‘at, to, or by a greater distance’, there is no difference in meaning, and both are equally correct. Further is a much more common word, though, and is additionally used in various abstract and metaphorical contexts, for example referring to time, in which farther is unusual, e.g.:
without further delay
Have you anything further to say?
We intend to stay a further two weeks.
The same distinction is made between farthest and furthest, e.g.:
the farthest point from the sun
The first team has gone furthest in its analysis.
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