Source : Webster's Revised Unabridged Dictionary (1913)

Hierarchical \Hi`er*arch"ic*al\, a. [Cf. F. hi['e]rarchique.]
   Pertaining to a hierarchy. -- {Hi`er*arch`ic*al*ly}, adv.

Source : WordNet®

hierarchically
     adv : in a hierarchical manner; "hierarchically organized"