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Noun: vaporware  'vey-pur,wehr
Usage: US (elsewhere: vapourware)
  1. An advertised product whose launch is uncertain, esp. computer software
    "The highly anticipated game turned out to be vaporware, never actually released to the public";
    - vapourware [Brit, Cdn]

Type of: computer software, package, software, software package, software program, software system

Encyclopedia: Vaporware