Feminity and femininity are both old words, originating around the beginning of the 15th century, and they’ve always shared their definitions. Feminity has faded from the language over time, however, and femininity is now the preferred form.
Examples
Feminity appears occasionally—for example:
She proved that there is enormous strength in feminity. [The Daily Sound (article now offline)]
They are a mixture of playfulness, menace and wry feminity. [Bangkok Post]
But most publications prefer femininity—for example:
Oh, don’t get me wrong: I love Rachel Comey’s femininity … [The New York Times]
Diaz conveys ironclad toughness along with alluring femininity … [Washington Post]
As they say in the film, banking is such an alpha-male society and it’s very hard for women to succeed within it and yet maintain some sense of femininity. [The Guardian]
Where last season’s focus was on 1950s femininity, now designers are mining the 1970s. [New Zealand Herald]
