Usually means: Very large, engineered structure or system.
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We found 10 dictionaries that define the word megastructure:

General (9 matching dictionaries)
  1. megastructure: Merriam-Webster
  2. megastructure: Oxford Learner's Dictionaries
  3. megastructure: American Heritage Dictionary of the English Language
  4. megastructure: Collins English Dictionary
  5. megastructure: Wiktionary
  6. megastructure: Infoplease Dictionary
  7. megastructure: Dictionary.com
  8. Megastructure (disambiguation), Megastructure: Wikipedia, the Free Encyclopedia
  9. megastructure: TheFreeDictionary.com

Slang (1 matching dictionary)
  1. megastructure: Urban Dictionary

Definitions from Wiktionary (megastructure)

noun:  A very large structure.
noun:  (architecture) A specific type of structure characterized by very large buildings with strictly artificial forms.
noun:  (science fiction) A hypothetical structure not possible with current technology, e.g., a Dyson sphere.
noun:  (uncountable) The large-scale structure of a material, as contrasted to the fine-scale structure.

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