では

Etymology 1
Compound of particle and. In this case, the is used in its contrastive function, emphasizing that the statement is about the portion preceding the  in contrast to other possibilities.

Particle

 * 1) at, in a place

Etymology 2
Of and.

Conjunction

 * 1) well, so, well then
 * 2) * From the Emacs tutorial (English)

Interjection

 * 1)  that's all for now

Usage notes

 * Can be reduplicated as.