Crossdresser or Transgender or ?

[ReineD]

Traditionally, transgender means a person with opposite mental and physical genders,

And also people who sometimes feel as if they are the opposite gender. Many CDs feel this way. Also those who wish to get in touch with aspects of the opposite gender, without necessarily identifying as such. The latter group is considered TG, since these individuals do cross (the definition of "trans" is "to cross") gender boundaries at some level.

and a transsexual is a transgender person living as their mental gender.

No. There are TSs who know they are women, but they still live as male, for a variety of reasons.