Definition of injection in English:

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Pronunciation: /ɪnˈdʒɛkʃ(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.
1.2 [mass noun] The action of injecting: the walls have been damp-proofed 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.
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.
2 [mass noun] The entry or placing of a spacecraft or other object into an orbit or trajectory.
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.
3 Mathematics A one-to-one mapping.


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

Words that rhyme with injection

abjection, affection, circumspection, collection, complexion, confection, connection, convection, correction, defection, deflection, dejection, detection, direction, ejection, election, genuflection, imperfection, infection, inflection, inspection, insurrection, interconnection, interjection, intersection, introspection, lection, misdirection, objection, perfection, predilection, projection, protection, refection, reflection, rejection, resurrection, retrospection, section, selection, subjection, transection, vivisection

For editors and proofreaders

Line breaks: in|jec¦tion

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