# injection

/ˌɪnˈdʒɛkʃən/ (US) · /ɪndʒˈɛkʃən/ (UK)

Source: https://englishreference.com/word/injection
Updated: 2026-06-20

## Senses

### 1. medical shot

noun · CEFR B1

the act of putting medicine into your body using a needle and a syringe.

For teachers: the administration of a liquid medication or other substance into the body via a needle and syringe.

- The nurse gave him an injection in his arm to help with the pain.
- The patient required a subcutaneous injection of insulin twice daily to manage his blood sugar levels effectively.

### 2. financial boost

noun · CEFR B2

a large amount of money added to a business or project to help it succeed.

For teachers: the provision of a significant amount of capital to an organization to improve its financial health or support a specific project.

- The small company survived thanks to a cash injection from a new investor.
- The government announced a massive injection of funds into the public transport sector to modernize the aging rail infrastructure.

### 3. fuel system

noun · CEFR B2 · Technical

the way fuel is forced into an engine to make it run.

For teachers: the pressurized introduction of fuel into the combustion chamber of an internal combustion engine.

- Modern cars use electronic fuel injection instead of old-fashioned carburetors.
- The mechanic explained that a fault in the fuel injection system was causing the engine to stall at high speeds.

### 4. computing/security

noun · CEFR C1 · Technical

the act of putting extra code into a computer program, often to attack it.

For teachers: the exploitation of a computer bug by processing invalid data to change the course of execution, such as in a SQL injection attack.

- The website was hacked using a common technique called SQL injection.
- Developers must sanitize all user inputs to prevent malicious code injection that could compromise the database integrity.

### 5. mathematical function

noun · CEFR C1 · Technical

a rule where every starting value matches to a different result.

For teachers: a function that maps distinct elements of its domain to distinct elements of its codomain; a one-to-one mapping.

- In this math problem, we need to prove that the function is an injection.
- The student demonstrated that the mapping was an injection by showing that no two distinct inputs produced the same output value.

## Examples

- 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.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.