IFR (disambiguation)

IFR is instrument flight rules, rules for when flight by outside visual reference is not safe.

IFR may also refer to:

  • Infection fatality rate in epidemiology.
  • Ideal final result, an engineering design goal
  • In-flight refueling
  • Institute of Food Research, an agricultural and food science research institution
  • Integral fast reactor, a nuclear reactor design
  • International Federation of Robotics
  • International Fleet Review, various publication of the same name
  • Instantaneous wave-free ratio (iFR), a diagnostic medical test used in coronary artery stenosis assessment
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