# fundamentally

/ˌfəndəˈmɛnəɫi/ (US) · /fˌʌndəmˈɛntəli/ (UK) · CEFR B2 · Adverb

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

## Definition

at the most basic or important level. You use this to talk about the core truth of something, even if it looks different on the outside.

For teachers: relating to the most basic or essential parts of something; in a way that affects the core nature of a person, thing, or idea.

## Examples

- The two plans are fundamentally the same.
- While the new software looks different, the way it processes data remains fundamentally unchanged.
- The philosopher argued that despite cultural differences, all human societies are fundamentally driven by the same basic needs for security and social connection.

## Usage notes

- Typically placed before the adjective or verb it modifies to emphasize a core characteristic.

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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.