Noun
border; boundary
usu. さかい
彼は生死の境をさ迷った。He hovered between life and death. turning point; watershed
often ...を~に
area; region; spot; space; environment
usu. きょう
psychological state; mental state
usu. きょう
cognitive object; something perceptible by the sense organs or mind
Buddhism
Also written 界【さかい】