1. A reference to the production of goods; especially, those made in factories.
2. Relating to factories, the people who work in factories, or the things made in factories: "Steve is an industrial engineer who is researching thousands of industrial uses for plastic."
3. Having developed numerous factories which are actively making products: "China has become a major industrial nation."
4. A descriptive term for groups of productive organizations that produce or supply goods, services, or sources of income.