2 : being of crucial importance; "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions"- Henry Kissinger; "the polar events of this study"; "a polar principal"
3 : characterized by opposite extremes; completely opposed; "in diametric contradiction to his claims"; "diametrical (or opposite) points of view"; "opposite meanings"; "extreme and indefensible polar positions"
4 : extremely cold; "an arctic climate"; "a frigid day"; "gelid waters of the North Atlantic"; "glacial winds"; "icy hands"; "polar weather"
adjectif
1 : of or existing at or near a geographical pole or within the Arctic or Antarctic Circles
