1. 
[syn: hierarchical, hierarchal, hierarchic]
The Collaborative International Dictionary of English v.0.48:
hierarchic \hi`er*arch"ic\, hierarchical \hi`er*arch"ic*al\, a.
   [Cf. F. hi['e]rarchique.]
   Of or pertaining to a hierarchy; ordered in a hierarchy. --
   Hi`er*arch`ic*al*ly, adv.
   Syn: hierarchical, hierarchal.
        [1913 Webster]
   2. Pertaining to a transitive relation between objects by
      which they may be ordered into a hierarchy; as, a
      hierarchical relation.
      [PJC]
WordNet (r) 3.0 (2006):
hierarchical
    adj 1: classified according to various criteria into successive
           levels or layers; "it has been said that only a
           hierarchical society with a leisure class at the top can
           produce works of art"; "in her hierarchical set of values
           honesty comes first" [syn: hierarchical, hierarchal,
           hierarchic] [ant: nonhierarchic, nonhierarchical]