# geological

/ˌdʒiəˈɫɑdʒɪkəɫ/ (US) · /dʒˌɪəlˈɒdʒɪkəl/ (UK) · CEFR B2 · Adjective

Source: https://englishreference.com/word/geological
Updated: 2026-05-02

## Definition

relating to the study of the Earth's rocks, layers, and how they change over time. You use this to describe things that happen over millions of years.

For teachers: relating to the study of the Earth's physical structure and substance. Often used to describe processes or time scales that occur over extremely long periods.

## Examples

- The Grand Canyon shows many geological layers.
- Scientists use geological evidence from deep ice cores to understand how the planet's climate changed thousands of years ago.
- The region's unique geological history, marked by volcanic activity and tectonic shifts, created a landscape that is both beautiful and dangerous for modern infrastructure projects.

## Usage notes

- Typically precedes the noun it modifies; often used in the phrase 'geological time' to contrast with human history.

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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.