unusualness

from WordNet (r) 3.0 (2006)

unusualness
    n 1: uncommonness by virtue of being unusual [ant: {usualness}]

from The Collaborative International Dictionary of English v.0.48

Unusual \Un*u"su*al\, a.
   Not usual; uncommon; rare; as, an unusual season; a person of
   unusual grace or erudition. -- {Un*u"su*al*ly}, adv. --
   {Un*u"su*al*ness}, n.
   [1913 Webster]