noun, noun or participle which takes 'suru', transitive verb
maintenance; preservation; keeping up
Used for actively keeping something in its current state, such as systems, health, peace, or standards. The gloss 'improvement' is a contextual extension when maintaining requires ongoing effort, but the core meaning is sustaining an existing condition.
健康を維持するために毎日運動している。
I exercise every day to maintain my health.
このシステムの維持には多額の費用がかかる。
Maintaining this system costs a lot of money.