fuel.
Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
Meaning & usage
Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
Substance that provides nourishment for a living organism; food.
Something that stimulates, encourages or maintains an action.
His books were fuel for the revolution.
Money is the fuel for economy.
Where this word comes from
From Middle English fuayle, from Old French fouaille, feuaille (“firewood, kindling”), from feu (“fire”), from Late Latin focus (“fire”), from Latin focus (“hearth”), whence English focus. Cognate with Spanish fuego (“fire”), and Portuguese fogo (“fire”).
To provide with fuel.
To exacerbate, to cause to grow or become greater.
Where this word comes from
From Middle English fuayle, from Old French fouaille, feuaille (“firewood, kindling”), from feu (“fire”), from Late Latin focus (“fire”), from Latin focus (“hearth”), whence English focus. Cognate with Spanish fuego (“fire”), and Portuguese fogo (“fire”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.