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