Source : Webster's Revised Unabridged Dictionary (1913)

Polarity \Po*lar"i*ty\, n. [Cf. F. polarit['e].]
   1. (Physics) That quality or condition of a body in virtue of
      which it exhibits opposite, or contrasted, properties or
      powers, in opposite, or contrasted, parts or directions;
      or a condition giving rise to a contrast of properties
      corresponding to a contrast of positions, as, for example,
      attraction and repulsion in the opposite parts of a
      magnet, the dissimilar phenomena corresponding to the
      different sides of a polarized ray of light, etc.

   2. (Geom.) A property of the conic sections by virtue of
      which a given point determines a corresponding right line
      and a given right line determines a corresponding point.
      See {Polar}, n.

Source : WordNet®

polarity
     n 1: a relation between two opposite attributes or tendencies;
          "he viewed it as a balanced polarity between good and
          evil" [syn: {mutual opposition}]
     2: having an indicated pole (as the distinction between
        positive and negative electric charges); "he got the
        polarity of the battery reversed"; "charges of opposite
        sign" [syn: {sign}]