사단

Etymology 1
.

Noun

 * 1)  military division

Etymology 2
.

Noun

 * 1) association; society; civic organization (non-governmental organization organized by private citizens for cultural, academic or public welfare purposes)

Etymology 3
, introduced by the fourth-century BCE philosophical treatise .

Noun

 * 1)  the four universal emotions that reveal the fundamental goodness of humanity: