What does the word polarity mean?

Usage examples for polarity

  1. It will be seen that such a change of polarity in the nervous centres is only a permanent form and an extreme degree of an emotional disturbance, which as a temporary and comparatively unimportant personal accident is far from being uncommon,- is so frequent, in fact, that every one must have known instances of it, and not a few must have had more or less serious experiences of it in their own private history. – A Mortal Antipathy by Oliver Wendell Holmes, Sr.
  2. The only practical difficulty was presented when the polarity of the electrical charge upon an object in the neighborhood of the car was unknown to those in the car, and happened to be opposite to that of the charge which the car, at that particular moment, was bearing. – Edison's Conquest of Mars by Garrett Putman Serviss
  3. The fixed polarity of cuttings from full grown stems cannot be destroyed; it is the expression of previous development. – Darwin and Modern Science by A.C. Seward and Others