This is the literal translation of "interveniência", which means "interposição, intervenção"... thus intervention in English, or something similar like involvement, participation, etc.

Hope this at least points you in the right direction. Good luck!

:)

It could be a mediation or an arbitration, depending on the context.
...issues arising from a contract are are submitted to arbitration by an arbitrator according to the rules and regulations of the
American Arbitration Association...

AAA - Arbitration, Mediation and other forms of Alternative ... Non-profit provider of alternative dispute resolution services.
www.adr.org/ - 21k - Em cache - Páginas Semelhantes