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

Related Noun(s):locomotive

Category: Objects

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

"Medieval engines of war"

Category: Objects

3.Definition: motor that converts thermal energy to mechanical work

Category: Objects

4.Definition: something used to achieve a purpose

"An engine of change"

Category: General