The Collaborative International Dictionary of English v.0.48:
Extraordinariness \Ex*traor"di*na*ri*ness\, n. The quality of being extraordinary. [R.] --Gov. of the Tongue. [1913 Webster]WordNet (r) 3.0 (2006):
extraordinariness n 1: the quality of being extraordinary and not commonly encountered [ant: mundaneness, mundanity, ordinariness]