cmos
C2technical
Definition
Meaning
A common type of semiconductor technology for manufacturing integrated circuits (especially in computer memory and processors).
Also refers to the low-power memory chip on a computer's motherboard that stores BIOS/UEFI settings.
Linguistics
Semantic Notes
The term is typically used as a noun or an attributive noun (acting as an adjective). It is an initialism, but often pronounced as a word.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Pronunciation may have slight vowel variation.
Connotations
Neutral, purely technical term in both varieties.
Frequency
Used with equal frequency in both technical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
N of N (CMOS of the camera)V N (reset the CMOS)Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Used in procurement or technical specification contexts for hardware.
Academic
Common in electrical engineering and computer science papers discussing chip design.
Everyday
Rarely used outside of computer troubleshooting or photography contexts.
Technical
Ubiquitous in electronics, computing, and digital imaging literature and manuals.
Examples
By Part of Speech
adjective
British English
- The CMOS settings need updating.
- It's a CMOS imaging sensor.
American English
- The CMOS configuration was lost.
- Check the CMOS battery level.
Examples
By CEFR Level
- My computer's time was wrong, so I changed the CMOS battery.
- The technician cleared the CMOS to reset the motherboard's firmware settings to default.
- Modern smartphone cameras utilise back-illuminated CMOS sensors for superior low-light performance.
Learning
Memory Aids
Mnemonic
CMOS = Complementary Metal-Oxide-Semiconductor (the full form). Think 'see-moss' growing on an old computer chip.
Conceptual Metaphor
THE COMPUTER'S MEMORY IS A NOTEBOOK (the CMOS is a small, persistent notebook for critical settings).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- May be incorrectly translated as a general 'chip' or 'microchip' (чип).
- Avoid confusing with RAM (оперативная память) or ROM (ПЗУ). CMOS is specific.
- The abbreviation is not declined in English; it's 'the CMOS', not declinable like in Russian.
Common Mistakes
- Pronouncing each letter individually (C-M-O-S) is less common than the word-like pronunciation.
- Using it as a plural (e.g., 'cmoses'). It is typically used as a singular mass noun.
- Confusing it with BIOS/UEFI software. CMOS is the physical hardware storing the settings.
Practice
Quiz
What is the primary function of the CMOS in a modern PC?
FAQ
Frequently Asked Questions
No. BIOS/UEFI is the firmware (software) that initialises hardware. The CMOS is the physical, low-power memory chip where the BIOS/UEFI settings are stored.
The CMOS battery (usually a coin cell) powers the memory chip to retain settings when the computer is off. When it dies, the system loses its time/date and custom BIOS settings.
It resets all BIOS/UEFI firmware settings stored on the CMOS chip back to their factory defaults. This can solve certain boot or hardware configuration problems.
No. CMOS technology is used in many integrated circuits. A very common application is in digital image sensors (CMOS sensors) found in cameras, smartphones, and scientific equipment.