What is the meaning of polar?

adjective

• Having a pair of equal and opposite charges.
• Characterized by opposite extremes; completely opposed.
  • usage: "in diametric contradiction to his claims"; "diametrical (or opposite) points of view"; "opposite meanings"; "extreme and indefensible polar positions"
  • synonyms: diametric, diametrical, opposite
• Located at or near or coming from the earth's poles.
  • usage: "polar diameter"; "polar zone"; "a polar air mass"; "Antarctica is the only polar continent"
• Of or existing at or near a geographical pole or within the Arctic or Antarctic Circles.
  • usage: "polar regions"
• Extremely cold.
  • usage: "an arctic climate"; "a frigid day"; "gelid waters of the North Atlantic"; "glacial winds"; "icy hands"; "polar weather"
  • synonyms: arctic, frigid, gelid, glacial, icy
• Being of crucial importance.
  • usage: "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions- Henry Kissinger; "the polar events of this study"; "a polar principal"
  • synonyms: pivotal