Look up IFR in Wiktionary, the free dictionary.
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 Financing Review, a financial magazine
 - International Fleet Review, various publications of the same name
 - Instantaneous wave-free ratio (iFR), a diagnostic medical test used in coronary artery stenosis assessment
 
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