fuel

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Something consumed to produce energy, especially:
2. n. A material such as wood, coal, gas, or oil burned to produce heat or power.
3. n. Fissionable material used in a nuclear reactor.
4. n. Nutritive material metabolized by a living organism; food.
5. n. Something that maintains or stimulates an activity or emotion: "Money is the fuel of a volunteer organization” ( Natalie de Combray).
6. v. To provide with fuel.
7. v. To support or stimulate the activity or existence of: rhetoric that fueled the dissenters.
8. v. To take in fuel.

Century Dictionary and Cyclopedia

1. n. Any matter which serves by combustion for the production of fire; combustible matter, as wood, coal, peat, oil, etc.
2. n. Figuratively, anything that serves to feed or increase something conceived as analogous to flame, as passion or emotional excitement.
3. To feed or furnish with fuel or combustible matter.

Wiktionary

1. n. Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
2. n. Substance that provides nourishment for a living organism; food.
3. n. Something that stimulates, encourages or maintains an action.
4. v. to provide fuel
5. v. to exacerbate, to cause to grow or become greater

GNU Webster's 1913

1. n. Any matter used to produce heat by burning; that which feeds fire; combustible matter used for fires, as wood, coal, peat, etc.
2. n. Anything that serves to feed or increase passion or excitement.
3. v. To feed with fuel.
4. v. To store or furnish with fuel or firing.

WordNet 3.0

1. v. provide with fuel
2. n. a substance that can be consumed to produce energy
3. v. provide with a combustible substance that provides energy
4. v. stimulate.
5. v. take in fuel, as of a ship