Engine meaning

noun

1. motor that converts thermal energy to mechanical work

2. something used to achieve a purpose

   “an engine of change”

3. a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

   Synonymslocomotivelocomotive enginerailway locomotive

4. an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.

   “medieval engines of war”