| farther | (adverb) to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense) | Synonyms: further |
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| (adverb) to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense) | Synonyms: further |
| farthest | (adverb) to the greatest distance in space or time (`farthest' is used more often than `furthest' in this physical sense) | Synonyms: furthest |
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| (adverb) to the greatest degree or extent or most advanced stage (`furthest' is used more often than `farthest' in this abstract sense) | Synonyms: furthest |