Meaning

noun a plane curve traced by a point circling about the center but at increasing distances from the center

noun a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle

noun a continuously accelerating change in the economy

originFrom Middle French spirale, from Medieval Latin spiralis, from Latin spīra, from Ancient Greek σπεῖρα (speîra, “wreath, coil, twist”).

Etymology from Wiktionary, CC BY-SA 3.0