Real Dictionary

Art Deco
Art Deco is a style of decoration and architecture that was common in the 1920s and 30s. It uses simple, bold designs on materials such as plastic and glass.

art deco in American English
a decorative style of the late 1920s and the 1930s derived from cubism, based generally on geometric forms, and applied to furnishings, textiles, graphic arts, etc.: revived in the mid-1960s
noun: a style of decorative art developed originally in the 1920s with a revival in the 1960s, marked chiefly by geometric motifs, curvilinear forms, sharply defined outlines, often bold colors, and the use of synthetic materials, as plastics

Art Deco in British English
style of art, jewellery, design, etc
noun: a style of interior decoration, jewellery, architecture, etc, at its height in the 1930s and characterized by geometrical shapes, stylized natural forms, and symmetrical utilitarian designs adapted to mass production