A large department store modeling the architectural design of a warehouse. These are usually built in the suburbs where land is much cheaper than downtown.

So named because they resemble shipping giant boxes plopped in the middle of a sea of parking.

A large store (superstore) run by a major corporation.

No one knows where the term came from (Because the store's goods are shipped in big boxes? Because the store looks like a big box?) As a result, anyone using the term should be slapped with a large trout for using a phrase which they themselves don't really understand.

A chain of physically large stores.