propulsion
- 01 C1 Advanced
the force or process that moves an object forward.
the action of driving or pushing forward; the process of propelling an object through a medium.
Simple“The rocket uses powerful engines for propulsion to reach space.”
In context“The spacecraft relies on ion propulsion for long-distance travel, as it is far more fuel-efficient than traditional chemical rockets.”
UsageOften used as an uncountable noun when referring to the general concept of movement.
- 02 C1 Advanced
a specific system or engine that makes a vehicle move.
a specific mechanism or system, such as an engine or motor, that provides the force for movement.
Simple“The ship's main propulsion failed, leaving the crew stuck at sea.”
In context“Engineers are developing a new nuclear propulsion system that could significantly reduce the time required for a manned mission to Mars.”
Synonymspower plantengine
“Simplifying the steering system was an important part of achieving that size while retaining propulsion based on photon recoil.”
“It seems like there’s nothing that is preventing us from reestablishing three-axis control of the spacecraft with the remaining reaction wheel, with the remaining thrusters, as well as the electric propulsion.”
Borrowed from Medieval Latin propulsio, propulsionis, from the past participle of Latin propello (“to drive forward, drive forth, drive away, drive out”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.