axis

a straight line through a body or figure that satisfies certain conditions

the main stem or central part about which plant organs or plant parts such as branches are arranged

in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations; "the Axis opposed the Allies in World War II"

a group of countries in special alliance

the 2nd cervical vertebra; serves as a pivot for turning the head

the center around which something rotates