injection
n. countablen. the act of putting a liquid, like medicine, into someone's body using a needle. It is a quick way to get a drug into the blood.
n. the act of introducing a liquid substance, typically a drug or vaccine, into the body via a syringe and needle. Also used figuratively to describe a sudden introduction of something new, such as capital into a business.
The nurse gave me an injection to help with the pain.
The doctor recommended a flu injection before the winter season to help prevent serious illness.
The struggling startup required a massive injection of venture capital to scale its operations and remain competitive in the global market.
Borrowed from Middle French injection, from Latin iniectio. The mathematical sense is from French injection, introduced by Nicolas Bourbaki in their treatise Éléments de mathématique. Equivalent to inject + -ion.
Commonly takes the preposition 'of' for the substance being injected and 'into' for the recipient.