# UEFI

CEFR C2 · Noun

Source: https://englishreference.com/word/uefi
Updated: 2026-07-22

## Definition

Stands for Unified Extensible Firmware Interface. It is the modern software that starts your computer and connects the hardware to the operating system.

For teachers: Abbreviation for Unified Extensible Firmware Interface. A specification for a software program that connects a computer's firmware to its operating system, replacing the legacy BIOS standard.

## Examples

- You can change the boot order in the UEFI settings.
- When building a new PC, you must ensure the motherboard supports UEFI to take advantage of faster boot times and larger hard drives.
- The transition from legacy BIOS to UEFI allowed for more robust pre-boot security features, such as Secure Boot, which prevents unsigned code from executing during the startup process.

## Usage notes

- Often used as a modifier before another noun, such as 'UEFI settings' or 'UEFI mode'.

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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.