1. to act as arbiter upon (a disputed question) : to settle (a dispute between two people or groups) after hearing the arguments and opinions of both. To make an official decision that ends a legal disagreement between people or groups without the need for the disagreement to be solved in court.To mediate between two (or more) parties in conflict. We need someone to arbitrate in this employee dispute before it affects the whole company. Arbitrator" means any Arbitrator other than a "Party Arbitrator. Arbitration is an alternative dispute resolution process that offers parties an opportunity to settle their disputes outside the courtroom. Arbitrate is when a neutral third party helps end a conflict. Arbitrate derives from the Latin arbiter "judge. Protecting tenants from excessive rent increases and unjust evictions while assuring landlords fair and adequate rents.