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English definition of “polar”

polar

adjective  /ˈpoʊ·lər/ us  

polar adjective (OF A PLACE)

[not gradable] of or near the area around the most northern or most southern points of the earth: the polar ice cap a polar expedition

polar adjective (OF ELECTRICITY)

relating to either of the two ends of a magnet or two parts of a battery (= device that produces electricity) which have opposite charges: fig. The play’s main characters are polar opposites (= They are completely opposite). chemistry Polar also describes a substance whose molecules have opposite positive and negative poles
(Definition of polar from the Cambridge Academic Content Dictionary © Cambridge University Press)
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