(1) “Advertisement” means the outdoor display by painting, pasting, or affixing on any surface, a picture, emblem, word, figure, numeral, or lettering for the purpose of making anything known;
(2) “Scenic highway” means any highway, road, or sections of the highway or road designated as a scenic highway from time to time by the general assembly under this part; and
(3) “Sign, structure or advertising device” means any structure, post, tree, fence, rock, rigid or semirigid, with or without advertising displayed on the device, situated upon or attached to real property outdoors, primarily for the purpose of furnishing a background or support upon which advertisement may be affixed.