We found one dictionary that defines the word megamerge:

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1. megamerge: Wiktionary

Definitions from Wiktionary (megamerge) ▸ verb:  To merge into a megamerger. ▸ Words similar to megamerge ▸ Usage examples for megamerge ▸ Idioms related to megamerge ▸ Wikipedia articles (New!) ▸ Words that often appear near megamerge ▸ Rhymes of megamerge ▸ Invented words related to megamerge