Meaning

noun a series of ordered groupings of people or things within a system

noun the organization of people at different ranks in an administrative body

originFrom Middle English ierarchie, jerarchie, from Old French ierarchie, jerarchie, from Late Latin ierarchia, from Latin hierarchia, from Ancient Greek ἱεραρχία (hierarkhía, “rule of a high priest”), from ἱεράρχης (hierárkhēs, “high priest”), from ἱερός (hierós, “holy”) + ἄρχω (árkhō, “to rule”), equivalent to hiero- + -archy. The H was re-added c. 1500 due to influence from Classical Latin.

Etymology from Wiktionary, CC BY-SA 3.0