[1] : The Collaborative International Dictionary of English v.0.48

far \far\, a. fartherand farthestare used as the compar.
   and superl. of far, although they are corruptions arising
   from confusion with further and furthest. see further.
   oe. fer, feor, as. feor; akin to os. fer, d. ver, ohg.
   ferro, adv., g. fern, a., icel. fjarri, dan. fjirn, sw.
   fjerran, adv., goth. faimacrra, adv., gr. ????? beyond,
   skr. paras, adv., far, and prob. to l. per through, and e.
   prefix for-, as in forgive, and also to fare. cf. farther,
   farthest.
   1. distant in any direction; not near; remote; mutually
      separated by a wide space or extent.
      1913 webster

            they said, . . . we be come from a far country.
                                                  --josh. ix. 6.
      1913 webster

            the nations far and near contend in choice.
                                                  --dryden.
      1913 webster

   2. remote from purpose; contrary to design or wishes; as, far
      be it from me to justify cruelty.
      1913 webster

   3. remote in affection or obedience; at a distance, morally
      or spiritually; t enmity with; alienated.
      1913 webster

            they that are far from thee ahsll perish. --ps.
                                                  lxxiii. 27.
      1913 webster

   4. widely different in nature or quality; opposite in
      character.
      1913 webster

            he was far from ill looking, though he thought
            himself still farther.                --f. anstey.
      1913 webster

   5. the more distant of two; as, the far side called also off
      side of a horse, that is, the right side, or the one
      opposite to the rider when he mounts.
      1913 webster

   note: the distinction between the adjectival and adverbial
         use of far is sometimes not easily discriminated.
         1913 webster

   by far, by much; by a great difference.

   far between, with a long distance of space or time
      between; at long intervals. "the examinations are few and
      far between." --farrar.
      1913 webster
see also:
farther farthest further by far far between 

[2] : WordNet (r) 2.0

by far
     adv : by a considerable margin; "she was by far the smartest
           student"; "it was far and away the best meal he had
           ever eaten" syn: far and away, out and away
see also:
far and away out and away 

Far >> F Words
Far, definition of term: Far
far_pag1.html

Far East >> F Words
Far East, definition of term: Far East
far+east_pag1.html

By Far >> B Words
By Far, definition of term: By Far
by+far_pag1.html

Far And Near >> F Words
Far And Near, definition of term: Far And Near
far+and+near_pag1.html

As Far As >> A Words
As Far As, definition of term: As Far As
as+far+as_pag1.html

Dolce Far Nient >> D Words
Dolce Far Nient, definition of term: Dolce Far Nient
dolce+far+nient_pag1.html

Far And Away >> F Words
Far And Away, definition of term: Far And Away
far+and+away_pag1.html