A system is a set of connected things or rules that work together as a whole; it can also mean an organised method or procedure for doing something. Example: She developed a reliable system for organising her vocabulary notes.
What Does System Mean?
System comes from the Greek systema — literally "a whole composed of several parts" — via Late Latin. It entered English in the early 17th century and now appears across virtually every domain of life: technology, biology, politics, education, and everyday organisation.
In its most concrete sense, a system is a group of physical parts connected and working together: the solar system, the nervous system, a computer system. In a more abstract sense, it describes an organised set of rules, ideas, or procedures: the education system, a tax system, or simply "a system" meaning a personal method.
The key idea in every use of system is interconnection — the parts are not random; they relate to each other and work towards a shared purpose. This is what distinguishes a system from a mere collection or list.
Example Sentences
| Sentence | Level & usage note |
|---|---|
| I use a simple system to remember new words: I write them in a notebook. | A2 — personal method |
| The school has a new system for tracking students' progress. | B1 — organisational procedure |
| She developed a reliable system for organising her vocabulary notes. | B1 — developed method (given example) |
| Corruption has undermined public trust in the entire political system. | B2 — abstract institutional system |
| The immune system deploys a sophisticated array of defences against pathogens. | C1 — scientific, technical register |
Common Collocations
| Collocation | Example in context |
|---|---|
| operating system | Make sure your operating system is up to date before installing the software. |
| transport system | London's transport system carries millions of passengers every day. |
| immune system | Regular exercise is known to strengthen the immune system. |
| education system | The education system needs more investment in teacher training. |
| filing system | She set up a colour-coded filing system to manage all the documents. |
| support system | Having a strong support system of friends helped him through a difficult time. |
| alarm system | They installed a new alarm system after the break-in. |
| set up a system | We need to set up a system for handling customer complaints efficiently. |
| political system | Different countries have very different political systems. |
| solar system | There are eight planets in our solar system. |
Usage Notes
Using "system" correctly
System is always a countable noun. Always use it with an article or determiner: a system, the system, this system, our system. Saying "I have system for it" (without an article) is a common learner error.
Verb collocations to learn: you set up, develop, create, build, or introduce a system. You can also run, maintain, or manage a system. When something goes wrong, you overhaul or reform a system. Someone might also bypass or abuse a system.
System vs. method: A method is a single procedure or technique. A system implies multiple connected parts. You might use a method to solve one specific problem; you build a system to manage an ongoing process.
Common Mistakes
Watch Out For
I have system for learning new words every day.
I have a system for learning new words every day. (countable — always needs an article)
The country needs a systemic approach to teaching. (meaning step-by-step)
The country needs a systematic approach to teaching. (systematic = following a plan; systemic = affecting an entire system)
We must to system our files better.
We must systematise our files better. (system is a noun only; use systematise as the verb)