# CPU

/ˌsiˌpiˈju/ (US)

Source: https://englishreference.com/word/cpu
Updated: 2026-08-08

## Senses

### 1. the computer's brain

noun · CEFR B2 · Technical

Stands for Central Processing Unit. This is the main chip in a computer that follows instructions and runs programs.

For teachers: Abbreviation for Central Processing Unit. The primary component of a computer that performs most of the processing inside the hardware.

- If your CPU gets too hot, the computer might slow down to protect itself.
- Modern laptops often use multi-core CPUs to handle several demanding applications simultaneously without a drop in performance.

Usage: Usually used with 'the' as a singular countable noun.

### 2. computer-controlled player

noun · CEFR B2 · Informal

A character in a video game that is controlled by the computer rather than a person.

For teachers: An entity or opponent in a video game whose actions are determined by the software's artificial intelligence rather than a human player.

- I didn't have anyone to play with, so I practiced against the CPU.
- The game's difficulty settings primarily affect how aggressively the CPU reacts to the player's tactical movements.

Teaching tip: In gaming contexts, 'the CPU' is often treated as a proper name for the computer opponent.

### 3. the computer tower

noun · CEFR B2 · Informal

The large box or case that holds all the main parts of a desktop computer.

For teachers: The chassis or tower of a personal computer, often used metonymically to refer to the entire system unit.

- Make sure there is enough space behind the CPU for the cables to fit.
- While technically incorrect, many office workers refer to the entire metal tower under their desk as the CPU.

Teaching tip: Technically, the CPU is just a small chip, but many people use this word to mean the whole computer box.

## Examples

- The computer is slow because the CPU is very old.
- Modern video games require a powerful CPU to handle complex physics and artificial intelligence calculations.
- Upgrading the CPU can significantly reduce the time required for video rendering, as the new architecture allows for more efficient parallel processing of data.

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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.