The Collaborative International Dictionary of English v.0.48:
Ennoblement \En*no"ble*ment\, n. 1. The act of making noble, or of exalting, dignifying, or advancing to nobility. --Bacon. [1913 Webster] 2. That which ennobles; excellence; dignity. [1913 Webster]WordNet (r) 3.0 (2006):
ennoblement n 1: the state of being noble 2: the act of raising someone to the nobility