Source : Webster's Revised Unabridged Dictionary (1913)

Solemness \Sol"em*ness\, n.
   {Solemnness}.

         Some think he wanted solemnes.           --Sir H.
                                                  Wotton.

Source : WordNet®

solemness
     n : a trait of dignified seriousness [syn: {sedateness}, {staidness},
          {solemnity}]