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engine

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engine/ˈɛnʤən/noun
pluralengines
engine
/ˈɛnʤən/
noun
pluralengines
Learner's definition of ENGINE  
[count]
: a machine that changes energy (such as heat from burning fuel) into mechanical motion
: the vehicle that pulls a train : locomotive
formal + literary 
: something that is used for a particular purpose
   b  : something that produces a particular and usually desirable result
— see also fire engine, search engine
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