po·lar·i·ty /poˈlærəti, pə-/
 有兩極,磁性引力,極性,傾向,截然相反


 po·lar·i·ty /poˈlærətɪ, pə-/ 名詞
 極性


 polarity
 極性 PO


 Po·lar·i·ty n.
 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.

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 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]