Unification (noun)

1. The act of unifying or the state of being unified.
2. The combining of separate entities into one more efficient or effective entity.

Origin:

Late 16th century: from latin unificatio(n-), from unificare 'make into one', from uni- 'one' + facere 'make'.

Examples:

1. The unification of Germany in 1990 was a significant event in European history.
2. The company's management is committed to the unification of its departments.
3. The unification of Italy in 1861 was a major event in European history.
4. Unification of the two companies would result in economies of scale.
5. The unification of the country after the civil war was a long and difficult process.