Definition of "Polar" :

adjective: having a pair of equal and opposite charges

adjective: being of crucial importance

"The polar events of this study."

adjective: extremely cold

"Polar weather."

adjective: characterized by opposite extremes; completely opposed

"Extreme and indefensible polar positions."

adjective: of or existing at or near a geographical pole or within the Arctic or Antarctic Circles

"Polar regions."

adjective: located at or near or coming from the earth's poles

"Polar diameter."