The Collaborative International Dictionary of English v.0.48:
Tidiness \Ti"di*ness\, n. The quality or state of being tidy. [1913 Webster]WordNet (r) 3.0 (2006):
tidiness n 1: the habit of being tidy [ant: untidiness] 2: the trait of being neat and orderly [syn: tidiness, neatness] [ant: messiness, untidiness]