Unification is the joining of separate parts into one. German unification, the unification of the country, unification talks.
It is used of countries above all: German unification in 1990 and Italian in 1861 are the standard examples, and both were far messier than the word suggests. In physics, unification is the attempt to describe the forces of nature with one theory.
1noununificationThe joining of separate parts into one.
“The unification of Italy in the nineteenth century joined many small states into one country.”
unification is a joining.