Audi alteram partem

Audi alteram partem (or audiatur et altera pars) is a Latin phrase meaning "listen to the other side", or "let the other side be heard as well". It is the principle that no person should be judged without a fair hearing in which each party is given the opportunity to respond to the evidence against them.

"Audi alteram partem" is considered to be a principle of fundamental justice or equity or the principle of natural justice in most legal systems. This principle includes the rights of a party or his lawyers to confront the witnesses against him, to have a fair opportunity to challenge the evidence presented by the other party, to summon one's own witnesses and to present evidence, and to have counsel, if necessary at public expense, in order to make one's case properly.

The phrase has come to be used as the motto for various political and judicial organisations, and is also the origin of the name of the German carmaker Audi.

As a general principle of rationality in reaching conclusions in disputed matters, "Hear both sides" was treated as part of common wisdom by the ancient Greek dramatists. A similar principle can also be found in Islamic law, based on a hadith indicating that in litigation, both parties must be heard. The principle was referred to by the International Court of Justice in the Nuclear Tests case, referring to France's non-appearance at judgment. Modern legal systems differ on whether individuals can be convicted in absentia. The principle is used in labour law matters in countries like South Africa and Zimbabwe.

The Political Interest Society of the University of Melbourne uses the phrase as its motto. The All-Campus Judicial Council of the University of Rochester has used the phrase as its motto since 2001.

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