weightiness

from WordNet (r) 3.0 (2006)

weightiness
    n 1: the relative importance granted to something; "his opinion
         carries great weight"; "the progression implied an
         increasing weightiness of the items listed" [syn: {weight},
         {weightiness}]
    2: the property of being comparatively great in weight; "the
       heaviness of lead" [syn: {heaviness}, {weightiness}] [ant:
       {lightness}, {weightlessness}]

from The Collaborative International Dictionary of English v.0.48

Weightiness \Weight"i*ness\, n.
   The quality or state of being weighty; weight; force;
   importance; impressiveness.
   [1913 Webster]