fuel (Noun) — A substance that can be consumed to produce energy. ex. "more fuel is needed during the winter months" ex. "they developed alternative fuels for aircraft"
fuel (Verb) — Provide with a combustible substance that provides energy. ex. "fuel aircraft, ships, and cars"
fuel (Verb) — Provide as a source of energy or heat. ex. "Oil fuels the furnace"
fuel (Verb) — Take in fuel, as of a ship. ex. "The tanker fueled in Bahrain"
fuel (Verb) — Stimulate. ex. "fuel the debate on creationism"