Rest in peace recapture of these words, read as "come and rest in peace," has been transferred to the ancient Talmudic prayers, in a mixture of Hebrew and Aramaic of the 3rd century AD. It is used to this day in traditional Jewish ceremonies. Other variations include "Requiescat in pace et in amore" for "May she rest in peace and love", and “In pace requiescat et in amore”. The word order is variable because Latin syntactical relationships are indicated by the inflexional endings, not by word order. If “Rest in peace” is used in an imperative mood, it would be “Requiesce in pace”
Latin Wikipedia When occasionally a term for a modern concept cannot be found, the customary practice is to do exactly what most other languages do: to borrow an international word (often from a Romance language or English). Such direct borrowing was done for the particle names and and for the unit of temperature . The word is given a Latin morphology if this can be done easily, or, if not, used unchanged in its foreign form; but many international words already have a Latin or Graeco-Latin appearance, because Greek and Latin have always served as sources of new scientific terminology. Vicipaedia made