# adversarial

/ˌædvɝˈsɛɹiəɫ/ (US) · /ˌædvəsˈeəɹɪəl/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/adversarial
Updated: 2026-05-20

## Definition

describing a situation where two sides are in a fight or competition. In law, it means that the two parties in a case are working against each other to win.

For teachers: characterised by opposition or conflict between two or more parties. In a legal context, it describes a system or process where the parties are treated as opponents rather than as partners in a shared process.

## Examples

- The legal system is adversarial, so both sides try to win.
- In an adversarial environment, the defense attorney must constantly challenge the prosecution's evidence to protect their client.
- The shift from an inquisitorial to an adversarial system of justice requires a significant change in how evidence is presented and how judges manage courtroom dynamics.

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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.