How Well Do You Know English Slang?
1879, Latin, literally "way of living or getting along" (see modus).
Modus vivendi is any temporary compromise that enables parties to carry on pending settlement of a dispute that would otherwise paralyse their activities. [Fowler]
A compromise between adversaries that allows them to get along temporarily: “During the separation, my parents adopted a modus vivendi that enabled them to tolerate each other.” From Latin, meaning a “method of living.”