intervener
/ˌɪntərˈvinər/
noun
- A person or group that becomes involved in a situation to change or influence it, especially in a conflict or dispute.
- The teacher acted as an intervener when the students started arguing in class.
- In the legal case, the judge allowed an intervener to present evidence on behalf of the environment.
- The United Nations sent an intervener to help negotiate peace between the two countries.
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