Definition of "empty"

adjective:
- Devoid of content; containing nothing or nobody; vacant.
  
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- Containing no elements (as of a string or array), opposed to being null (having no valid value).
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To make empty; to void; to remove the contents of.
  
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noun:
- A bottle previously containing some liquid, especially a drink, and that is now empty.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License