Source : Webster's Revised Unabridged Dictionary (1913)

High-mindedness \High"-mind`ed*ness\, n.
   The quality of being highminded; nobleness; magnanimity.

Source : WordNet®

high-mindedness
     n : elevated ideals or conduct; the quality of believing that
         ideals should be pursued [syn: {idealism}, {noble-mindedness}]