"expansiveness" in the noun sense
1. expansiveness, expansivity
a quality characterized by magnificence of scale or the tendency to expand
"the expansiveness of their extravagant life style was soon curtailed"
2. effusiveness, expansiveness, expansivity
a friendly open trait of a talkative person
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License