1.NounA three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original (i.e., all aspect ratios are preserved)."To test the hydrodynamics of the dam, the civil engineers not only ran computer simulations but also even built and flooded a scale model of the dam and the surrounding valley.; A scale model of a cargo aircraft was perched on the desk of the air force officer. "As they say, guns start wars, but logistics win them," he said."