The Collaborative International Dictionary of English v.0.48:

Inferiority \In*fe`ri*or"i*ty\, [Cf. F. inf['e]riorit['e].]
   The state of being inferior; a lower state or condition; as,
   inferiority of rank, of talents, of age, of worth.
   [1913 Webster]

         A deep sense of our own great inferiority. --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inferiority
    n 1: the state of being inferior [syn: inferiority, lower
         status, lower rank]
    2: an inferior quality [syn: inferiority, low quality] [ant:
       high quality, superiority]
    3: the quality of being a competitive disadvantage [syn:
       inferiority, unfavorable position]