agregar

v. add; aggregate; incorporate; tack on

v. accrete, aggregate; assemble, accumulate; mass, collect

= aggregate, append, throw in.
Ex: You have attempted to aggregate the UDC class number incorrectly.
Ex: A list of book review sources in psychology and related fields is appended.
Ex: There is a real difference of interest between the needs and purposes of research libraries and the public libraries, and I would also throw in the school and almost certainly junior college libraries.