noun
self and others; both sides; one's side and the other side
Literary or formal noun contrasting oneself/one's side with another person/opposing side. Often used in analytical or comparative contexts.
彼我の戦力差は明らかだった。
The difference in military strength between the two sides was clear.
彼我の立場を冷静に分析する必要がある。
It is necessary to calmly analyze the positions of both sides.