# crux

/ˈkɹəks/ (US) · /kɹˈʌks/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/crux
Updated: 2026-08-15

## Definition

the most important part of a problem or an argument. It is the central point that everything else depends on.

For teachers: the most essential or decisive point of an issue or argument. Often used to identify the core element that must be resolved to reach a conclusion.

## Examples

- The crux of the matter is that we lack funding.
- After hours of debate, the committee finally reached the crux of the problem: the software was simply incompatible with the old hardware.
- While the lawyers argued over minor procedural details, the judge reminded them that the crux of the case remained whether the defendant had acted with clear intent.

## Usage notes

- Usually appears in the singular form, often in the phrase 'the crux of the matter'.

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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.