Maintenance or preservation: keeping a state or level, maintaining something in good condition, or preserving the status quo (often used as '維持する').
設備を良好な状態に維持するために点検を行う。
Inspections are carried out to keep the equipment in good condition.
現状維持ではなく改善を目指すべきだ。
We should aim for improvement rather than maintaining the status quo.
ダイエット中でも適切な体重を維持することが大切だ。
Even during a diet, it's important to maintain a proper weight.