The Collaborative International Dictionary of English v.0.48:

Superordination \Su`per*or`di*na"tion\, n. [Pref. super- +
   ordination: cf. L. superordinatio.]
   The ordination of a person to fill a station already
   occupied; especially, the ordination by an ecclesiastical
   official, during his lifetime, of his successor. --Fuller.
   [1913 Webster]

WordNet (r) 3.0 (2006):

superordination
    n 1: the semantic relation of being superordinate or belonging
         to a higher rank or class [syn: hypernymy,
         superordination]