# key to

CEFR B1 · Prepositional phrase

Source: https://englishreference.com/word/key-to
Updated: 2026-04-24

## Definition

the main thing that leads to something or makes it possible — often used for solutions, secrets, or essential factors.

For teachers: introducing the essential element or solution to a problem, situation, or outcome; typically followed by a noun phrase indicating the result or goal.

## Examples

- The key to success is hard work.
- The teacher explained that the key to solving the problem was understanding the basic principles.
- In his speech, the economist emphasized that the key to long-term economic stability lies in sustainable resource management.

## Usage notes

- followed by a noun or noun phrase indicating the result, goal, or essential factor.
- Teaching tip: contrast with 'the secret to' (more mysterious) and 'the solution to' (more direct), which share the same prepositional structure but differ in connotation.

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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.