hierarch comes from Medieval Latin hierarcha, from Ancient Greek hierarkhēs ('high priest'), from hieros ('sacred') + arkhein ('to rule, lead'). The path is chiefly one of transmission: the word passes through the named languages and forms, with each stage preserving part of the modern shape. In present English, the noun sense is "a chief priest or high-ranking official in a hierarchy", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hierarchy, hierarchical, and hieratic, and in derivatives such as hierarchal and hierarchical. Its semantic neighborhood includes prelate, pontiff, primate, and dignitary, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Ancient Greek ἱεράρχης, Ancient Greek ἱερός, and Ancient Greek ἄρχειν.