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fuel (n.)

c. 1200, feuel, feul "fuel, material for burning," also figurative, from Old French foaille "fuel for heating," from Medieval Latin legal term focalia "right to demand material for making fire, right of cutting fuel," from classical Latin focalia "brushwood for fuel," from neuter plural of Latin focalis "pertaining to a hearth," from focus "hearth, fireplace" (see focus (n.)). Figurative use from 1570s. Of food, as fuel for the body, 1876. As "combustible liquid for an internal combustion engine" from 1886. A French derivative is fouailler "woodyard." Fuel-oil is from 1882.

fuel (v.)

1590s, "feed or furnish with fuel," literal and figurative, from fuel (n.). Intransitive sense "to get fuel" (originally firewood) is from 1880. Related: Fueled; fueling.

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Definitions of fuel from WordNet
1
fuel (v.)
provide with a combustible substance that provides energy;
fuel aircraft, ships, and cars
fuel (v.)
provide with fuel;
Synonyms: fire
fuel (v.)
take in fuel, as of a ship;
The tanker fueled in Bahrain
fuel (v.)
stimulate;
fuel the debate on creationism
2
fuel (n.)
a substance that can be consumed to produce energy;
more fuel is needed during the winter months
they developed alternative fuels for aircraft
From wordnet.princeton.edu