Unification describes the bringing together of two or more things so they become a single unit. If your marriage turns your feuding families into one big happy group, you pulled off a unification that would make Romeo and Juliet jealous.
Unification comes from the word unify, which traces back to the Middle French word unifier, meaning "to make into one." Unification often happens in the corporate world, and you might have heard the term merger used to describe this process. If two or more companies decide to become a single company in order to benefit their business, they must first go through a legal process to complete the unification.