| Subject | English | French |
| tech., mech.eng. | four stroke engine | moteur à quatre temps |
| environ. | four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | moteur à quatre temps |
| gen. | four- stroke engine | moteur à quatre temps |
| mech.eng. | four-stroke cycle engine | moteur à quatre temps |
| tech., mech.eng. | four-stroke engine | moteur à quatre temps |
| transp., mech.eng. | pressure charged four-stroke diesel engine | moteur Diesel quatre temps suralimentés |
| transp., tech. | pressure-charged four-stroke diesel engines | moteur Diesel quatre temps suralimenté |