Definition of injection in English:


Syllabification: in·jec·tion
Pronunciation: /inˈjekSH(ə)n


1An instance of injecting or being injected: painkilling injections an injection of capital was needed
More example sentences
  • There is no proven benefit to topical ointments, suppositories, or injections of local anesthetic.
  • The area is numbed with an injection of local anesthetic.
  • It also highlighted excessive use of injections and blood transfusions without proper sterilisation.
1.1A thing that is injected: a morphine injection
More example sentences
  • Although I have a very high pain threshold, I was requiring more and more morphine injections.
  • The pain subsided more than usual and I was spared the pin cushion process of endless morphine injections.
  • Some patients benefit from physical therapy and cortisone injections.
1.2The action of injecting: sometimes a polio vaccine is given by injection
More example sentences
  • Usually they are given by intravenous injection, by infusion pump into a vein or orally.
  • EDITOR We have three comments about Pickup et al's meta-analysis comparing insulin infusion with injection, which may cast a different light on their main conclusion.
  • Samples were introduced by gravity injection from 20 cm height for 20 s.
1.3 short for fuel injection.
More example sentences
  • Compared to the systems in today's direct-injected diesels, the injection systems will probably operate at lower pressures, which will keep the costs down.
  • We are making big inroads with our diesel injection technology, and currently we equip the Duramax and Cummins light truck diesel engines with our components.
  • A proportion of the new model was sold with the carry-over, 2.5 litre, 8 valve, indirect injection diesel engine.
2The entry or placing of a spacecraft or other object into an orbit or trajectory.
More example sentences
  • Since injection into orbit the spacecraft's behaviour has been nominal.
  • The spacecraft becomes fully automated after injection into orbit.
  • An autonomous telemetry system transmitted data on the payload environment during all the flight phases, from liftoff to in-orbit injection.


late Middle English: from Latin injectio(n-), from the verb inicere (see inject).

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