/ ɪnˈdʒekʃn; NAmE / noun
1.
[ C , U ] an act of injecting sb with a drug or other substance :
to give sb an injection
He was treated with penicillin injections.
An anaesthetic was administered by injection .
daily injections of insulin
2.
[ C ] a large sum of money that is spent to help improve a situation, business, etc. :
The theatre faces closure unless it gets an urgent cash injection.
3.
[ U , C ] an act of forcing liquid into sth :
a fuel injection system
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WORD ORIGIN
late Middle English : from Latin injectio(n-) , from the verb inicere , from in- into + jacere throw.