Word
propulsion
Phoneticspropul·sion
US/pɹəˈpəɫʃən/
UK/pɹəpˈʌlʃən/
Definitions
01the act of pushing forward
C1 · Advanced Uncountable noun Science Technical
n. the force or process that moves an object forward.
n. the action of driving or pushing forward; the process of propelling an object through a medium.
“The rocket uses powerful engines for propulsion to reach space.”
“The spacecraft relies on ion propulsion for long-distance travel, as it is far more fuel-efficient than traditional chemical rockets.”
Usage
Often used as an uncountable noun when referring to the general concept of movement.
02a mechanical system
C1 · Advanced Countable noun Computing Technical
n. a specific system or engine that makes a vehicle move.
n. a specific mechanism or system, such as an engine or motor, that provides the force for movement.
“The ship's main propulsion failed, leaving the crew stuck at sea.”
“Engineers are developing a new nuclear propulsion system that could significantly reduce the time required for a manned mission to Mars.”
Synonyms
Real-World Examples
“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.” Etymology
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.
Word family
VERB
NOUN
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
- Frequency
- Frequent
- Level
- C1 · Advanced
- Updated
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