An object that's rebuilt has been put back together again after being broken or damaged. This can include anything from an old car to a house.
Rebuilt things are often very special because they've had their whole history before, and now they have a new one too. Imagine you buy an antique piano that used to belong to a famous musician - it's been rebuilt at some point in its life. The word is also used for buildings, like old houses that were torn down but then put back together again with new parts.
To build again.
Which has been rebuilt
Example: rebuilt engine
