merger

noun5

1. •
   The act or process of merging two or more parts into a single unit.

   • Club mergers reduced the number of teams by half
2. •
   The legal union of two or more corporations into a single entity, typically assets and liabilities being assumed by the buying party.
3. •
   An absorption of one or more estate(s) or contract(s) into one other, all being held by the same owner; of several counts of accusation into one judgement, etc.
4. •
   A type of sound change where two or more sounds merge into one.

   • the cot-caught merger
5. •
   One that merges.