a person who intervenes, especially in a lawsuit.
Also, intervener.

1615–25; intervene + -or2

nonintervener, noun
nonintervenor, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intervene (ˌɪntəˈviːn)
vb (foll by in or between)
1.  (often foll by in) to take a decisive or intrusive role (in) in order to modify or determine events or their outcome
2.  to come or be (among or between)
3.  (of a period of time) to occur between events or points in time
4.  (of an event) to disturb or hinder a course of action
5.  economics to take action to affect the market forces of an economy, esp to maintain the stability of a currency
6.  law to interpose and become a party to a legal action between others, esp in order to protect one's interests
[C16: from Latin intervenīre to come between, from inter- + venīre to come]

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