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A '''hierarchy''' is an arrangement of objects, people, elements, values, grades, orders, classes, etc., in a ranked or graduated series. The word derives from the Greek ἱεραρχία}} (''hierarchia''), from ''ἱεράρχης''  (''hierarches''), "president of sacred rites, high-priest" and that from ἱερός'' (''hieros''), "sacred" + ''ἄρχω'' (''arkho''), "to lead, to rule" [http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3D%2349989] [http://www.etymonline.com/index.php?search=Hierarchy&searchmode=none Online Etymology Dictionary]. The word can also refer to a series of such items so arranged. Items in a hierarchy are typically thought of as being "above," "below," or "at the same level as" one another. (Oxford English Dictionary ISBN 0-19-861186-2)

A '''hierarchy''' is an arrangement of objects, people, elements, values, grades, orders, classes, etc., in a ranked or graduated series. The word derives from the Greek ἱεραρχία}} (''hierarchia''), from ''ἱεράρχης''  (''hierarches''), "president of sacred rites, high-priest" and that from ἱερός'' (''hieros''), "sacred" + ''ἄρχω'' (''arkho''), "to lead, to rule" [http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3D%2349989] [http://www.etymonline.com/index.php?search=Hierarchy&searchmode=none Online Etymology Dictionary]. The word can also refer to a series of such items so arranged. Items in a hierarchy are typically thought of as being "above," "below," or "at the same level as" one another. (Oxford English Dictionary ISBN 0-19-861186-2)