True or False: An alloy is a metallic substance that consists of one metal and at least one other alloying element.

An alloy indeed refers to a metallic substance that is composed of one metal and at least one other element, which could also be a metal or a non-metal. This definition underlies the nature of alloys, emphasizing that they are not singular but rather mixtures that can enhance certain properties such as strength, ductility, and resistance to corrosion.

For example, steel is an alloy primarily made of iron, but it also includes carbon and possibly other elements, which help improve its characteristics compared to pure iron. This versatility is a key reason why alloys are widely used in automotive and construction industries.

The other options do not accurately reflect the definition of an alloy, as they either inaccurately suggest limitations (like being only pure metals) or incorrect associations with the elements involved. Thus, the assertion that an alloy is a combination of one metal and at least one other alloying element is correct.