We found one dictionary that defines the word megaconstruction:

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1. megaconstruction: Wiktionary

Definitions from Wiktionary (megaconstruction) ▸ noun:  A very large construction. ▸ Words similar to megaconstruction ▸ Usage examples for megaconstruction ▸ Idioms related to megaconstruction ▸ Wikipedia articles (New!) ▸ Popular adjectives describing megaconstruction ▸ Words that often appear near megaconstruction ▸ Rhymes of megaconstruction ▸ Invented words related to megaconstruction