engine

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en·gine / ˈenjən/ • n. 1. a machine with moving parts that converts power into motion. ∎  a thing that is the agent or instrument of a particular process: exports used to be the engine of growth.2. a railroad locomotive. ∎  hist. a mechanical device or instrument, esp. one used in warfare: a siege engine.DERIVATIVES: en·gined adj. [in comb.] a twin-engined helicopter.

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