po·lar·i·ty

[poh-lar-i-tee, puh-]
noun
1.
Physics.
a.
the property or characteristic that produces unequal physical effects at different points in a body or system, as a magnet or storage battery.
b.
the positive or negative state in which a body reacts to a magnetic, electric, or other field.
2.
the presence or manifestation of two opposite or contrasting principles or tendencies.
3.
Linguistics.
a.
(of words, phrases, or sentences) positive or negative character.

Origin:
1640–50; polar + -ity

non·po·lar·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
polarity (pəʊˈlærɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the condition of having poles
2.  the condition of a body or system in which it has opposing physical properties at different points, esp magnetic poles or electric charge
3.  the particular state of a part of a body or system that has polarity: an electrode with positive polarity
4.  the state of having or expressing two directly opposite tendencies, opinions, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Polarity is always a great word to know.
So is gobo. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Medical Dictionary

polarity po·lar·i·ty (pō-lār'ĭ-tē, pə-)
n.

  1. The property of having two opposite poles, such as those possessed by a magnet, or of having opposite properties or characteristics.

  2. The direction or orientation of positivity relative to negativity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
polarity   (pō-lār'ĭ-tē)  Pronunciation Key 
The condition of having poles or being aligned with or directed toward poles, especially magnetic or electric poles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The photograph had reversed the polarity of the planet.
He also investigated the rocks surrounding the bones and studied date
  indicators, such as their magnetic polarity.
Binary information can be represented also by the spin of an electron or the
  polarity of a photon.
If the polarity and frequency is compatible, the exchange and/or transfer take
  place.
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