Return (home); repatriation — the act of going back to one's home or country, often used for soldiers, astronauts, or repatriated people.
宇宙飛行士は無事に地球へ帰還した。
The astronaut returned safely to Earth.
戦地からの帰還を待つ家族の不安は大きい。
Families waiting for return from the battlefield are very anxious.
捕虜の帰還が正式に発表された。
The repatriation of the prisoners was officially announced.
Feedback in electronics or biological systems — the process by which output is fed back into the input of a system.
この増幅回路は帰還を利用して出力を安定させている。
This amplifier stabilizes its output by using feedback.
生体内には負の帰還機構が存在してホメオスタシスを保っている。
Negative feedback mechanisms exist in the body to maintain homeostasis.