Further and farther share meanings relating to distance, whether spatial, temporal, or metaphorical. They're used interchangeably as adjectives meaning "more distant,"
and also as adverbs meaning "at or to a greater distance or more advanced point."
They formerly shared other meanings as well, but in current use only further now commonly functions as an adjective meaning "additional,"
and only further is commonly used as an adverb meaning "to a greater degree or extent."
and "in addition"
Further alone functions as a verb synonymous with promote, a meaning farther never had.
We note that despite the word far appearing within farther, that pair is unrelated. Instead, farther is a variant of further that developed in the 14th century; further itself dates to Old English.





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