# cache invalidation

CEFR C2 · Compound

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

## Definition

the process of removing old or incorrect data from a computer's temporary storage. This makes sure the computer gets the newest version of the information next time.

For teachers: the process of declaring specific entries in a cache as stale or invalid, forcing the system to fetch fresh data from the primary source. Often cited as one of the most difficult problems in computer science due to the complexity of maintaining data consistency across distributed systems.

## Examples

- The developer performed a cache invalidation after updating the website images.
- Without proper cache invalidation, users might see old prices on the website even after the database has been updated.
- Efficient cache invalidation is critical for high-traffic applications to ensure that performance gains from data caching do not come at the cost of serving obsolete or inconsistent information to the end user.

## Usage notes

- Commonly used in software engineering and web development; often functions as a compound noun phrase.

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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.