magnanimousness

noun

The quality or state of being generous: big-heartedness, bounteousness, bountifulness, freehandedness, generosity, generousness, great-heartedness, large-heartedness, lavishness, liberality, magnanimity, munificence, openhandedness, unselfishness, unsparingness. See give/take/reciprocity.

The noun has one meaning:

Meaning #1: the quality of being exalted in character or ideals or conduct
  Synonyms: nobility, grandeur