The Collaborative International Dictionary of English v.0.48:

Candor \Can"dor\, n. [Written also candour.] [L. candor, fr.
   cand["e]re; cf. F. candeur. See candid.]
   [1913 Webster]
   1. Whiteness; brightness; (as applied to moral conditions)
      usullied purity; innocence. [Obs.]
      [1913 Webster]

            Nor yor unquestioned integrity
            Shall e'er be sullied with one taint or spot
            That may take from your innocence and candor.
                                                  --Massinger.
      [1913 Webster]

   2. A disposition to treat subjects with fairness; freedom
      from prejudice or disguise; frankness; sincerity.
      [1913 Webster]

            Attribute superior sagacity and candor to those who
            held that side of the question.       --Whewell.
      [1913 Webster]

WordNet (r) 3.0 (2006):

candour
    n 1: the quality of being honest and straightforward in attitude
         and speech [syn: candor, candour, candidness,
         frankness, directness, forthrightness]
    2: ability to make judgments free from discrimination or
       dishonesty [syn: fairness, fair-mindedness, candor,
       candour] [ant: unfairness]