What does it mean for an object to be at rest?

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I understand that "at rest" means that the velocity is equal to 0 (v(t)=0) but I am having a hard time creating a definitive answer surrounding the question.

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An object's velocity can only be measured relative to another object.

For example, suppose you are on a bus.

You are not moving on the bus, but the bus itself is moving. Therefore, you can say you are at rest "relative" to the bus, but you are moving relative to the ground/pavement.