To save for later use, sometimes by the use of a preservative.
To protect an environment, heritage, etc.
To remain unchanged during a process
Wilderness where human development is prohibited.
A jam or thick syrup made from fruit.
To maintain; to preserve; to prevent from deteriorating.
To continue with (work, etc).
To stay even or ahead.
To ensure that one remains well-informed about something.
To prevent someone from going to bed or to sleep