Overview
Medieval Hebrew is a literary and liturgical language that existed since the 4th century. It is not commonly used as a spoken language, but mainly in written form by rabbis, scholars and poets. Medieval Hebrew has many features distinguishing it from older forms of Hebrew. These affect grammar, syntax, sentence structure, and also includes a wide variety of new lexical items, which were either based on older forms or borrowed from other languages, especially Aramaic, Koine Greek and Latin.
From Wikipedia (CC BY-SA 4.0).