intervenor
/ˌɪntərˈvinər/
noun
- A person or group that becomes involved in a situation, especially a legal case or dispute, to influence the outcome.
- The judge allowed the community organization to join as an intervenor.
- As an intervenor, she presented evidence to support the workers' rights.
- The environmental group became an intervenor in the court case about the new factory.
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