American English

Definition of injection noun from the Oxford Advanced American Dictionary



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  1. 1[countable, uncountable] an act of injecting someone with a drug or other substance to give someone an injection He was treated with penicillin injections. An anesthetic was administered by injection. daily injections of insulin
  2. 2[countable] a large sum of money that is spent to help improve a situation, business, etc. The theater faces closure unless it gets an urgent cash injection.
  3. 3[uncountable, countable] an act of forcing liquid into something a fuel injection system
See the Oxford Advanced Learner's Dictionary entry: injection