Young woman. Also used as a label for stories intended for a young female audience.
directed towards young girls. Sailormoon is primarily a shoujo manga, as is Magic Knight Rayearth. Shoujo-oriented manga and anime tends to emphasize beauty, art, and character development and emotions. Appeals to males and females alike (although perhaps the really short fukus in Sailormoon have something to do with the large male following).
Shoujo is kind of complicated. It does mean "girls' love" in Japanese and can be mixed up with "yuri". However, on this site, Shoujo will stand for a Fluff-like fic, with girls' merely loving one another.