noun (n)

• a relation between two opposite attributes or tendencies(noun.linkdef)

  Example:
  He viewed it as a balanced polarity between good and evil.
  

  Synonym:
  mutual opposition
  

  source: wordnet30
• having an indicated pole (as the distinction between positive and negative electric charges)(noun.linkdef)

  Example:
  He got the polarity of the battery reversed.
  

  Synonym:
  sign
  

  source: wordnet30
• 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.(noun)

  source: webster1913