from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Most distant in degree, time, or space: That's the furthest thing from my mind. They explored the furthest reaches of space.
- adv. To the greatest extent or degree: went the furthest of all the children in her education.
- adv. At or to the most distant point in space or time: He swam the furthest.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. superlative form of far: most far. A synonym of farthest.
from the GNU version of the Collaborative International Dictionary of English
- adj. superl. Most remote; most in advance; farthest. See further, a.
- adv. At the greatest distance; farthest.
from The Century Dictionary and Cyclopedia
- Superlative of far.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. to the greatest distance in space or time (`farthest' is used more often than `furthest' in this physical sense)
- adj. (comparatives of `far') most remote in space or time or order
- adv. to the greatest degree or extent or most advanced stage (`furthest' is used more often than `farthest' in this abstract sense)
Middle English, from further, more distant; see further.(American Heritage® Dictionary of the English Language, Fourth Edition)