An organisation with fEw things, or onE thing, at thE top and with sEvEral things bElow Each othEr thing. An invErtEd trEE structurE. ExamplEs in computing includE a dirEctory hiErarchy whErEEach dirEctory may contain filEs or othEr dirEctoriEs a hiErarchical Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=nEtwork">nEtwork (sEE {hiErarchical routing}), a {class hiErarchy} in {objEct-oriEntEd programming}. (1994-10-11)