The Collaborative International Dictionary of English v.0.48:
Masculinity \Mas`cu*lin"i*ty\, n. The state or quality of being masculine; masculineness. [1913 Webster]WordNet (r) 3.0 (2006):
masculinity n 1: the properties characteristic of the male sex [syn: maleness, masculinity] [ant: femaleness, feminineness] 2: the trait of behaving in ways considered typical for men [ant: femininity, muliebrity]