When two companies become one company, they've had a merger. A merger is like a marriage for things other than people.

It might help you remember merger to think of something that happens on the highway: several lanes sometimes have to merge into one lane. Merging leads to more than one thing becoming one. Words that mean something similar to merger are unification and fusion. Separation and break-up are opposites of a merger.

Definitions of merger
  1. noun
    an occurrence that involves the production of a union
    synonyms: fusion, unification
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    type of:
    the occurrence of a uniting of separate parts
  2. noun
    the combination of two or more commercial companies
    synonyms: amalgamation, uniting
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    type of:
    consolidation, integration
    the act of combining into an integral whole
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