How is instantiation different from aggregation and from acquaintance?

How is instantiation different from aggregation and from acquaintance? (I have undertood the difference between aggregation and acquaintance, see the quote from the book here)

Instantiation and aggregation seem similar to each other.

• when object A instantiates or aggregate object B, it seems to me that object A must have a field member referencing object B.

• Both instantiation and aggregation seem to me not to allow more than one objects to instantiate or aggregate the same object.

There might also be other aspects which I miss to consider

I have asked What does "a class instantiates another" mean?, but I am still not very clear about instantiation relation between classes.