A Big-Box Store is a large, free standing rectangular single floor store built on a concrete slab. They are incredibly wasteful and ugly to look at having no aesthetic value what so ever. Typically have very large parking lots with no trees.
Also sometimes called a superstore, megastore, or supercenter.
Walmart is a good example of a big-box store.
Large, high-volume stores. I.e., Circuit City, IKEA, Target, Home Depot, Best Buy, etc.
The new shopping center outside of town has acres and acres of big-box stores.