Source : Webster's Revised Unabridged Dictionary (1913)

Advertence \Ad*vert"ence\, Advertency \Ad*vert"en*cy\, [OF.
   advertence, avertence, LL. advertentia, fr. L. advertens. See
   {Advertent}.]
   The act of adverting, of the quality of being advertent;
   attention; notice; regard; heedfulness.

         To this difference it is right that advertence should
         be had in regulating taxation.           --J. S. Mill.

Source : WordNet®

advertency
     n : the process of being heedful [syn: {advertence}]