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"
discuss vehemently in order to reach a solution or an agreement; "The leaders of the various Middle Eastern countries are trying to hammer out a peace agreement"
southeastern European plant cultivated for its fragrant purplish flowers and round flat papery silver-white seedpods that are used for indoor decoration