The Collaborative International Dictionary of English v.0.48:
Baronetage \Bar"on*et*age\, n. 1. State or rank of a baronet. [1913 Webster] 2. The collective body of baronets. [1913 Webster]WordNet (r) 3.0 (2006):
baronetage n 1: the collective body of baronets 2: the state of a baronet