Latin for “having changed what needs to be changed”, or less literally “other things being equal”. Generally used to indicate the applicability of a principle or idea to a different situation, having made appropriate adjustments.

By way of example (highlighted in bold): Rubin v Eurofinance SA [2010] EWCA Civ 895; [2011] Ch 133 at [61] per Ward LJ:

“(4) Albeit that they have the indicia of judgments in personam, the judgments of the New York court made in the adversary proceedings, are none the less judgments in and for the purposes of the collective enforcement regime of the bankruptcy proceedings and as such are governed by the sui generis private international law rules relating to bankruptcy and are not subject to the ordinary private international law rules preventing enforcement of judgments because the defendants were not subject to the jurisdiction of the foreign court. This is a desirable development of the common law founded on the principles of modified universalism. It does not require the court to enforce anything that it could not do, mutatis mutandis, in a domestic context.”