Definitions for "SEINEN"
Keywords:  manga, nen, aimed, genre, josei
Literally "young adult." Used to describe manga aimed at males over the age of 16. Often covers the same subject matter as shônen manga, but with college-age or adult male protagonists and more overt sexual elements. The majority of the manga series currently reviewed on MangaManiacs.org are seinen series, possibly because it seems that many (if not most) of the manga series being translated by American companies are seinen series.
A genre aimed at older men.
Young man. Used as a label for stories aimed at men in their teens or early twenties (generally sports, war, or adventure stories).