Adverb
1. to the greatest distance in space or time (`farthest' is used more often than `furthest' in this physical sense);
"see who could jump the farthest""chose the farthest seat from the door""he swam the furthest"2. to the greatest degree or extent or most advanced stage (`furthest' is used more often than `farthest' in this abstract sense);
"went the furthest of all the children in her education""furthest removed from reality""she goes farthest in helping us"