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an imaginary line in the middle of an object around which the object revolves
(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins
the 2nd cervical vertebra; serves as a pivot for turning the head
a group of countries in special alliance
in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations
the main stem or central part about which plant organs or plant parts such as branches are arranged
a real or imaginary line about which an object rotates