From Longman Dictionary of Contemporary Englishinjectionin‧jec‧tion /ɪnˈdʒekʃən/ ●●○ noun 1 [countable, uncountable]MHMD an act of putting a drug into someone’s body using a special needle → shot The nurse gave me a tetanus injection.injection of an injection of insulin The children hate having injections. The only sure treatment is antibiotics, preferably by injection.2 [countable]BFADD an addition of money to something in order to improve itinjection of a massive injection of public funds Our local football club may fold unless it gets a cash injection.3 [countable, uncountable]PUSH the act of forcing a liquid into something a fuel injection systemCOLLOCATIONSverbshave an injectionHe had to have an injection to relieve the pain.receive an injection formalThe boxer received an injection of the drug before the fight.give somebody an injectionThe nurse gave him an injection.administer an injection formal (=give someone an injection)She was taught how to administer an injection.adjectivesa pain-killing injectionI needed a pain-killing injection in my elbow.an intravenous injection (=into a vein)He had given the patient an intravenous injection to calm her down.a lethal injection (=one that kills someone)Pinkerton was executed by lethal injection.phrasesan injection against somethingYou may need to be given an injection against tetanus.
Examples from the Corpus
injection• a fuel-injection engine• Mrs. Wilson, I'm going to give you an injection to help you relax.• I hate having injections.injection of• The oil company is counting on a $1 billion injection of capital from the government for research. 