noun : ENGINE.
Source: WordNet 3.1
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1. (
) motor that converts thermal energy to mechanical work ;
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2. (
) something used to achieve a purpose; "an engine of change" ;
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3. (
) a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks ;
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4. (
) an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.; "medieval engines of war" ;
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