Your eyes are the same color as my storage unit.
—Overheard at a redneck bar
A repository commonly refers to a storage location, usually considered a place of safety or preservation of the items stored in it. When you store something in a repository and later return to retrieve it, you expect that it will be in the same state as it was in when you put it there. At some point you may choose to remove the stored item from the repository.
This basic set of principles applies to a DDD Repository. Placing an Aggregate (10) instance in its corresponding Repository, and later using that Repository to retrieve the same instance, yields the expected whole object. If you alter a preexisting Aggregate instance that you retrieve ...