Etymology
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polarity (n.)

1640s, "the having two opposite poles," originally of magnets, from polar + -ity. The sense of "variation in certain physical properties so that in one direction they are the opposite of what they are in the opposite direction" is from 1670s.

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Definitions of polarity

polarity (n.)
a relation between two opposite attributes or tendencies;
he viewed it as a balanced polarity between good and evil
Synonyms: mutual opposition
polarity (n.)
having an indicated pole (as the distinction between positive and negative electric charges);
he got the polarity of the battery reversed
Synonyms: sign
From wordnet.princeton.edu