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

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

Encyclopedia: Vapourware