Source : Webster's Revised Unabridged Dictionary (1913)

Grandness \Grand"ness\, n.
   Grandeur. --Wollaston.

Source : WordNet®

grandness
     n 1: a prominent status; "a person of importance" [syn: {importance}]
     2: unusual largeness in size or extent [syn: {enormousness}, {greatness},
         {immenseness}, {immensity}, {sizeableness}, {vastness}]
     3: the quality of being magnificent or splendid or grand [syn:
        {magnificence}, {brilliance}, {splendor}, {splendour}, {grandeur}]
     4: splendid or imposing in size or appearance; "the grandness
        of the architecture" [syn: {impressiveness}, {magnificence}]