The Collaborative International Dictionary of English v.0.48:

Dryness \Dry"ness\, n.
   The state of being dry. See Dry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dryness
    n 1: the condition of not containing or being covered by a
         liquid (especially water) [syn: dryness, waterlessness,
         xerotes] [ant: wetness]
    2: moderation in or abstinence from alcohol or other drugs [syn:
       sobriety, dryness]
    3: objectivity and detachment; "her manner assumed a dispassion
       and dryness very unlike her usual tone" [syn: dispassion,
       dispassionateness, dryness]