LEX NECESSITATIS EST LEX TEMPORIS I.E. INSTANTIS by Law Professor Latin, meaning The law of necessity is the law of time, that is time present. Related Posts:QUOD AB INITIO NON VALET IN TRACTU TEMPORIS NON CONVALESCITPRESENT (ADJ.)PUNCTUM TEMPORISIN CASU EXTREMAE NECESSITATIS OMNIA SUNT COMMUNIATEMPORIS EXCEPTIOHERETOFORE