bipolar vs unipolar

bipolar

adj
  • Relating to a bipole. 

  • Relating to or having bipolar disorder. 

  • Relating to both polar regions. 

  • Involving or having both extremes or poles at the same time. 

  • Of or relating to an international system in which two states wield most of the cultural, economic, and political influence. 

noun
  • A bipolar cell. 

unipolar

adj
  • Having a single pole. 

  • Not both depressive and manic; not bipolar. 

  • Of or relating to an international system in which one state wields most of the cultural, economic, and political influence. 

How often have the words bipolar and unipolar occurred in a corpus of books? (source: Google Ngram Viewer )