Subtleties of terminology

yyy:
"Aggregation, consolidation and integration" Financiers (and not only) often use these three words together, with each laid in a certain logical sense. What is the difference?

xxx:
Consolidation - the union. Two people meet each other and begin to make friends. uh.
Integration - mergers and acquisitions. One person says to another: and let you now move in with me live?
Aggregation - eight blondes in pink go together for a beer at night in Biryulyovo.
with bash