invariableness

from WordNet (r) 3.0 (2006)

invariableness
    n 1: the quality of being resistant to variation [syn:
         {invariability}, {invariableness}, {invariance}] [ant:
         {variability}, {variableness}, {variance}]

from The Collaborative International Dictionary of English v.0.48

Invariable \In*va"ri*a*ble\, a. [Pref. in- not + variable: cf.
   F. invariable.]
   Not given to variation or change; unalterable; unchangeable;
   always uniform.
   [1913 Webster]

         Physical laws which are invariable.      --I. Taylor.
   -- {In*va"ri*a*ble*ness}, n. -- {In*va"ri*a*bly}, adv.
   [1913 Webster]