two dimensions;  fictional world of anime, manga, video games, etc.
 after-party;  second party (of the night);  second meeting
 derivative work (usu. unauthorized and produced by fans, e.g. dōjinshi, fanfiction)
 two-dimensional complex;  people more interested in two-dimensional (i.e. anime or manga) girls than real people
 secondary cooling water (esp. in a pressurized water reactor)
 secondary electron multiplier
 being victimized after reporting sexual or other harassment