propulsion

propulsion — noun

1. a physical force that moves an object, such as a vehicle or spacecraft, in a par

1.nounB2
Definition

a physical force that moves an object, such as a vehicle or spacecraft, in a particular direction

Example

Sana studied how the propulsion of a space shuttle is generated during lift-off.

collocation: propulsion of [vehicle]

Without enough propulsion, the fishing boat could not move against the strong current.

uncountable; modified by 'enough'

Common collocations
  • jet propulsion
  • rocket propulsion
  • electric propulsion
  • provide propulsion
  • generate propulsion
  • source of propulsion
Synonyms
  • thrust

    more specific; refers to the measurable reaction force from expelling mass, commonly used for rockets and engines

  • drive

    broader; can refer to mechanical power transfer, not necessarily forward motion

  • motive power

    formal/technical; refers to the energy source that produces motion

Antonyms
  • resistance

    the opposing force that works against forward movement, such as drag or friction

Grammar Patterns

propulsion + of [something]

adjective + propulsion

Usage Note

Propulsion in this sense is uncountable and typically modified by an energy source or method (jet, rocket, electric). Unlike 'thrust', which refers to a specific reaction force measured in newtons, propulsion is a broader term for any forward-driving force.

Common Mistakes

The propulsion of the car was strong.
The car's propulsion system was powerful.
'propulsion' itself is uncountable and not typically described as 'strong'; instead describe the propulsion system or level of thrust.

2. the system or method by which an object is driven forward through a medium such

2.nounB2
Definition

the system or method by which an object is driven forward through a medium such as air or water

Example

The engineers developed a new propulsion system that uses solar power for deep-space missions.

collocation: propulsion system

Iker asked whether magnetic propulsion could replace traditional engines on high-speed trains.

compound noun: magnetic propulsion

Common collocations
  • propulsion system
  • propulsion technology
  • propulsion method
  • electric propulsion
  • nuclear propulsion
  • magnetic propulsion
Synonyms
  • propulsion system

    more explicit; refers to the complete assembly of components that produce motion

  • propulsion method

    highlights the approach or technique rather than the hardware

  • motive system

    formal; often used in engineering documents for the power-and-drive arrangement

Grammar Patterns

propulsion + system / technology / method

adjective + propulsion

Usage Note

This sense commonly appears in compound nouns describing a technology category — 'propulsion system', 'propulsion method', 'propulsion technology'. In everyday conversation, the simpler word 'engine' is more common than 'propulsion system'.

Common Mistakes

The propulsion is broken.
The propulsion system is broken.
'propulsion' as a process/system sense needs a qualifier like 'system' or 'method' when referring to the technology itself.

Word family

  • propel
    verbB2
  • propeller
    nounB2
  • propellant
    nounC1
  • propulsive
    adjectiveC1

Synonym discussion

Sense: noun/1

Thrust is the most precise synonym — it names the specific reaction force produced by expelling mass, commonly measured in newtons and discussed in aerospace engineering. Drive is a more general term that can refer to any mechanical power transmission (belt drive, four-wheel drive), not necessarily producing forward motion through a fluid. Power refers to the rate of energy transfer rather than the pushing force itself, so a system can have high power but low propulsion efficiency. Momentum describes an object's property of being in motion (mass × velocity), not the force that creates that motion. In practice: a jet engine produces thrust for propulsion; that thrust transfers power to the aircraft; the aircraft in motion carries momentum.

thrustdrive ↗power ↗momentum ↗

Common collocations

Nouns

Adverbs

Phrases

  • means of propulsion
  • source of propulsion
  • form of propulsion
  • method of propulsion

Prepositions

  • by propulsion
  • for propulsion
  • from propulsion

Etymology

LatinFrenchEnglish

Propulsion comes from the Latin verb 'propellere', formed from 'pro-' (forward) and 'pellere' (to push or drive), plus the suffix '-ion' indicating an action or process. The word entered English in the early 17th century, originally referring broadly to any act of driving forward, and later became specialized in physics and engineering contexts to describe the force or system that moves vehicles, aircraft, and spacecraft.