Modus vivendi is a Latin phrase signifying an agreement between those whose opinions differ, such that they agree to disagree.
Modus means mode, way. Vivendi means of living. Together, way of living, implies an accommodation between disputing parties to allow life to go on. It usually describes informal and temporary arrangements in political affairs. For example, where two sides reach a modus vivendi regarding disputed territories, despite political, historical or cultural incompatibilities, an accommodation of their respective differences is established for the sake of contingency. This sense of the term has been used as a keystone in the political philosophy of John Gray.