The Collaborative International Dictionary of English v.0.48:

Inherence \In*her"ence\, Inherency \In*her"en*cy\, n. [Cf. F.
   inh['e]rence.]
   The state of inhering; permanent existence in something;
   innateness; inseparable and essential connection. --Jer.
   Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inherence
    n 1: the state of inhering; the state of being a fixed
         characteristic; "the inherence of polysemy in human
         language" [syn: inherence, inherency]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "inherence":
   accessibility, actual presence, availability, being here,
   being there, essentiality, existence, fundamentality, hereness,
   immanence, immediacy, inbeing, indigenousness, indwelling,
   indwellingness, innateness, innerness, internality, intrinsicality,
   inwardness, nonobjectivity, occurrence, physical presence,
   presence, spiritual presence, subjectivity, thereness, ubiety,
   whereness