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• s  (of words) interchangeable in a given context without changing the import of the expression
• s  capable of being exchanged for another or for something else that is equivalent

• commutable

News & Articles

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• SMART Platforms Project, Aimed at Enabling an "App Store for Health," Names Advisory Committee
  BOSTON, April 15, 2014 /PRNewswire-USNewswire/ -- The SMART (Substitutable Medical Apps & Reusable Technology) Platforms project at Boston Children's Hospital—which is developing technology to create an app-driven health information economy—announced today the formation of an advisory committee that will guide the project on strategy, technical approach and business development. The advisory ...
  April 15, 2014 - PR Newswire via Yahoo! News

Quotes

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• Castro in Bloomberg
  Fidel is not substitutable,Raul Castro said in a speech. "The people will continue his work when he isn't physically here anymore."