Other forms: outputs; outputting; outputted
If your factory transforms steel into train wheels, your factory's output––what it produces––is train wheels. A country's output is the total quantity of goods it produces.
The word input is the opposite of output, but only in the sense of the process––if bananas, milk, and ice cream are the input, the output is a milkshake. But you don't usually talk about input in the aggregate, as something you measure over time for a factory, a company, or a country.