Axis

(noun) a straight line through a body or figure that satisfies certain conditions. Synonyms: axis.

(noun) the main stem or central part about which plant organs or plant parts such as branches are arranged. Synonyms: axis.

(noun) in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations. Example: "The axis opposed the allies in world war ii."

(noun) a group of countries in special alliance. Synonyms: bloc, axis.

(noun) the 2nd cervical vertebra; serves as a pivot for turning the head. Synonyms: axis, axis vertebra.

(noun) the center around which something rotates. Synonyms: axis, axis of rotation.