A more thorough explanation:

Definition: Ad hoc compromis is an agreement between two or more countries to submit a specific dispute to an arbitrator, an arbitral tribunal, or an international court.

For example, if two countries have a disagreement over a border dispute, they may agree to submit the issue to an ad hoc arbitral tribunal. This tribunal would be created specifically for this dispute and would not exist beyond its resolution.

Ad hoc compromis is different from a general compromis, which is an agreement where countries submit all or a definite class of disputes that may arise between them to an arbitral institution, a court, or an ad hoc arbitral tribunal by concluding a general arbitration treaty or by including an arbitration clause in a treaty.

Overall, ad hoc compromis is a way for countries to resolve specific disputes without resorting to violence or other harmful means.