injection

[in-jek-shuhn]

noun

1. the act of injecting.

2. something that is injected.

3. a liquid injected into the body, especially for medicinal purposes, as a hypodermic or an enema.

4. state of being hyperemic or bloodshot.

5. Mathematics.,  a one-to-one function.

6. Also called insertion. Aerospace.,  the process of putting a spacecraft into orbit or some other desired trajectory.

injection

/ ɪnˈdʒɛkʃən /

noun

1. fluid injected into the body, esp for medicinal purposes

2. something injected

3. the act of injecting

4. 1. the act or process of introducing fluid under pressure, such as fuel into the combustion chamber of an engine

   2. ( as modifier )

      injection moulding

5. maths a function or mapping for which f( x ) = f( y ) only if x = y See also surjection bijection

injection

1. A substance that is introduced into a organism, especially by means of a hypodermic syringe, as a liquid into the veins or muscles of the body.

2. A function that maps each member of one set (the domain) to exactly one member of another set (the range).

3. Compare bijection surjection

Other Word Forms

• postinjection adjective
• reinjection noun
• superinjection noun
• injective adjective

Word History and Origins

Origin of injection¹

First recorded in 1535–45, injection is from the Latin word injectiōn- (stem of injectiō ). See inject, -ion

Example Sentences

She received lots of tiny injections of polynucleotides, which was a "pretty painful procedure", but says it's helped reduce the dark circles under her eyes.

Read more on BBC

However these treatments require regular injections, refrigeration and can be prohibitively expensive.

Read more on Barron's

When the injections debuted, adoption was held back by shortages and uneven insurance coverage.

Read more on The Wall Street Journal

The director of one of the affected hospitals told the BBC the CCTVs in exam and injection rooms were meant to protect doctors from false allegations.

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I had been surprised that regular Rejuran was missing from my treatment list, but Dr. Suh explained that many clients find the injections too painful.

Read more on The Wall Street Journal

Related Words

• dose 
• needle