Fuel

1. Substance consumed to provide energy through combustion, or through chemical or nuclear reaction. The price of fuel is increasing.
2. Substance that provides nourishment for a living organism; food. Food is the fuel for the body.
3. Something that stimulated, encourages or maintains an action Money is the fuel for the economy.
4. To provide fuel. She fueled the car today.
5. To exacerbate, to cause to grow or become greater. Remarks made by the government fueled the mob's anger.