combustible matter used to maintain fire, as coal, wood, oil, or gas, in order to create heat or power.
something that gives nourishment; food.
an energy source for engines, power plants, or reactors: Kerosene is used as jet engine fuel.
something that sustains or encourages; stimulant: Our discussion provided him with fuel for debate.
verb (used with object), fueled, fueling or (especially British) fuelled, fuelling.
to supply with fuel.
verb (used without object), fueled, fueling or (especially British) fuelled, fuelling.
to obtain or replenish fuel.

1300–50; Middle English fuel(le), feuel < Old French feuaile < Vulgar Latin *focālia, neuter plural of *focālis of the hearth, fuel. See focus, -al1

fueler; (especially British) fueller, noun
defuel, verb (used with object), defueled, defueling or (especially British) defuelled, defuelling.
nonfuel, adjective
unfueled; (especially British) unfuelled, adjective
well-fueled; (especially British) well-fuelled, adjective

4. ammunition, sustenance, impetus, stimulus.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fuel (fjʊəl)
1.  any substance burned as a source of heat or power, such as coal or petrol
2.  a.  the material, containing a fissile substance, such as uranium-235, that produces energy in a nuclear reactor
 b.  a substance that releases energy in a fusion reactor
3.  something that nourishes or builds up emotion, action, etc
vb , fuels, fuelling, fuelled, fuels, fueling, fueled
4.  to supply with or receive fuel
[C14: from Old French feuaile, from feu fire, ultimately from Latin focus fireplace, hearth]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, from O.Fr. feuaile "bundle of firewood," from M.L. legal term *focalia "right to demand material for making fire," neut. pl. of L. focus "hearth." As a verb from 1590s. Related: Fueled; fueling.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
fuel   (fy'əl)  Pronunciation Key 
A substance that produces useful energy when it undergoes a chemical or nuclear reaction. Fuel such as coal, wood, oil, or gas provides energy when burned. Compounds in the body such as glucose are broken down into simpler compounds to provide energy for metabolic processes. Some radioactive substances, such as plutonium and tritium, provide energy by undergoing nuclear fission or fusion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Fuel definition

Almost every kind of combustible matter was used for fuel, such as the withered stalks of herbs (Matt. 6:30), thorns (Ps. 58:9; Eccl. 7:6), animal excrements (Ezek. 4:12-15; 15:4, 6; 21:32). Wood or charcoal is much used still in all the towns of Syria and Egypt. It is largely brought from the region of Hebron to Jerusalem. (See COAL.)

Easton's 1897 Bible Dictionary
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