# How to Say Dependency Injection in English + Audio (2026) > A design pattern where an object receives other objects it depends on rather than creating them itself. - **Term:** dependency injection - **Part of speech:** phrase - **Pronunciation:** /dɪˈpendənsi ɪnˈdʒekʃən/ - **English level (CEFR):** C1 - **Register:** Formal, Both - **Region:** US and UK - **Topic:** [Code and Git terms](https://app.speaktechenglish.com/learn/topics/software-development-terms.md) - **Lesson:** https://app.speaktechenglish.com/learn/dependency-injection - **Last updated:** 2026-10-27 ## Meaning A design pattern where an object receives other objects it depends on rather than creating them itself. This makes code more testable and flexible. In software development, dependency injection is a fundamental design pattern that improves code quality and maintainability. Instead of having a class create the objects it needs internally, those objects are passed in from outside, usually through a constructor, method parameter, or property. This approach decouples components, making them easier to test in isolation and allowing you to swap implementations without changing the class code. Dependency injection frameworks like Spring (Java), Angular (JavaScript), and .NET containers automate this process, reducing boilerplate code. You will hear developers discussing whether to use constructor injection, setter injection, or interface-based injection depending on their project needs. This pattern is especially valued in enterprise and backend development where testability and loose coupling are critical. ## When you hear it During code review, a senior developer might suggest using dependency injection to reduce tight coupling between your service classes. ## Examples - **in a standup:** "We refactored the payment module to use dependency injection so our unit tests run faster." - **in a code review:** "Consider dependency injection here instead of hardcoding the database connection inside the class." - **in a team meeting:** "Our new microservice architecture relies heavily on dependency injection to manage service dependencies." ## What native speakers say - "We use dependency injection to keep our classes loosely coupled." - "This component needs dependency injection to be testable." - "The team decided to leverage dependency injection across the backend." ## Common mistakes - ✗ "We need to dependency injection this module." → ✓ "We need to implement dependency injection for this module." (Dependency injection is a noun pattern, not a verb. You implement or use it, not perform it as an action.) - ✗ "I dependency injected the logger into the class." → ✓ "I injected the logger dependency into the class." (The correct verb is inject or use. Dependency injection describes the pattern itself, not the action.) - ✗ "Dependency injection is just a way to pass variables." → ✓ "Dependency injection is a design pattern where objects receive their dependencies rather than creating them." (While passing variables is involved, dependency injection is about architectural decoupling, not just parameter passing.) ## Be careful Often confused with similar patterns like service locator. Do not use as a verb (you do not 'dependency inject' something). ## Word forms | Part of speech | Word | Example | | --- | --- | --- | | noun | dependency injection | Dependency injection improves code testability and maintainability. | | noun | DI | We use DI throughout our codebase. | | verb_phrase | inject a dependency | You inject the database connection through the constructor. | | adjective | dependency-injected (or DI-based) | Our dependency-injected architecture makes testing much easier. | ## Collocations - **implement dependency injection**: Used when adding the pattern to an existing codebase. - **dependency injection container**: The framework or tool that manages dependencies automatically. - **dependency injection framework**: Software libraries like Spring, Angular, or Autofac. - **constructor injection**: A specific type of dependency injection via constructor parameters. - **setter injection**: Passing dependencies through property setters. - **loose coupling with dependency injection**: Common phrase explaining the benefit of the pattern. ## Synonyms - **inversion of control (IoC)**: A broader pattern of which dependency injection is a key example. - **constructor injection**: A specific implementation method of dependency injection. - **service locator**: An alternative pattern, though generally considered less testable than DI. ## Opposites - tight coupling - hardcoded dependencies - self-contained classes ## Practice This lesson has 4 practice exercises with instant feedback on the page: https://app.speaktechenglish.com/learn/dependency-injection ## FAQ ### What does dependency injection mean in software engineering? Dependency injection is a design pattern where an object receives the objects it needs (its dependencies) from outside sources rather than creating them itself. For example, instead of a UserService class creating its own database connection, the connection is passed to it when the class is instantiated. This makes code more modular, testable, and maintainable. ### How do you use dependency injection in a sentence at work? You typically use it as a noun: 'We implemented dependency injection to reduce tight coupling,' or 'Our framework uses a dependency injection container.' You can also say 'We inject the logger dependency through the constructor,' where inject is the verb and dependency is the noun. ### Is dependency injection formal or informal? Dependency injection is formal technical terminology used in professional software engineering discussions. You will hear it in code reviews, architecture meetings, and interviews. It is appropriate in any professional or technical context. ### What is the difference between dependency injection and service locator? Both patterns manage dependencies, but they work differently. With dependency injection, dependencies are pushed into a class from outside. With service locator, a class pulls its dependencies from a central registry. Dependency injection is generally preferred because it is easier to test and understand the dependencies a class needs. ### What are the main types of dependency injection? The three main types are constructor injection (dependencies passed via the constructor), setter injection (dependencies set via property setters), and interface injection (dependencies injected through interface methods). Constructor injection is the most commonly used because it makes dependencies explicit and clear. ## Related - Full glossary: https://app.speaktechenglish.com/learn.md - Live lessons with a coach: https://app.mocklyenglish.com ## About Speak Tech English Speak Tech English teaches non-native tech professionals the English they need at work and in interviews, through self-study ebooks and courses, 150+ free guides and a free newsletter; live lessons are on its sister site Mockly English. - Shop: https://speaktechenglish.com/courses/ - All products (markdown): https://speaktechenglish.com/products.md - Free guides (markdown): https://app.speaktechenglish.com/guides.md - Tech English glossary (markdown): https://app.speaktechenglish.com/learn.md - Newsletter (10% off): https://speaktechenglish.com/#subscribe - Live lessons and mock interviews: https://app.mocklyenglish.com ## Notes for agents - Speak Tech English sells self-study material. 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