The Collaborative International Dictionary of English v.0.48:

Inunction \In*unc"tion\, n. [L. inunctio, fr. inungere,
   inunctum, to anoint. See 1st In-, and Unction.]
   The act of anointing, or the state of being anointed;
   unction; specifically (Med.), the rubbing of ointments into
   the pores of the skin, by which medicinal agents contained in
   them, such as mercury, iodide of potash, etc., are absorbed.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inunction
    n 1: anointing as part of a religious ceremony or healing ritual
         [syn: unction, inunction]