The Collaborative International Dictionary of English v.0.48:
Boisterousness \Bois"ter*ous*ness\, n. The state or quality of being boisterous; turbulence; disorder; tumultuousness. [1913 Webster]WordNet (r) 3.0 (2006):
boisterousness n 1: a turbulent and stormy state of the sea 2: the property of being noisy and lively and unrestrained