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Definition of pilot light noun from the Oxford Advanced Learner's Dictionary

pilot light

noun
 
/ˈpaɪlət laɪt/
 
/ˈpaɪlət laɪt/
(also pilot)
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  1. a small flame that burns all the time, for example on a gas boiler, and lights a larger flame when the gas is turned on
See pilot light in the Oxford Advanced American Dictionary

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