# ultimatum

/ˌəɫtəˈmeɪtəm/ (US) · /ˌʌltɪmˈeɪtəm/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/ultimatum
Updated: 2026-05-07

## Definition

a final demand that someone must accept to avoid a serious problem or punishment. It is a 'do this or else' message.

For teachers: a final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations. Often used in diplomatic, legal, or interpersonal negotiations.

## Examples

- She gave him an ultimatum: arrive on time or leave.
- The union issued an ultimatum to the management, threatening a full-scale strike if the safety demands were not met by midnight.
- History is replete with diplomatic ultimatums that, while intended to force a peaceful concession, ultimately served as the formal precursors to declarations of war.

## Usage notes

- Commonly follows the verbs 'issue', 'give', or 'deliver'.

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