IFR

IFR

English

Proper noun

IFR

  1. (nuclear physics, engineering) Initialism of Integral Fast Reactor.

Noun

IFR

  2. (aviation, pilot training) Initialism of instrument flight rules, a set of rules for a pilot flying on instruments, primarily as a means of navigating through inclement weather.
    • 1953, F.N. Piasecki, L.S. Wigdortchik, “Can the Airlines Use the Helicopter?”, in SAE Transactions‎[1], volume 61, page 98:
      It is important to note that fuel reserves for transport helicopters will be much lower than those for airplanes in view of the helicopter’s inherent flight advantages under IFR (Instrument Flight Rules), and the greater availability of alternate landing areas.
    Coordinate terms: VFR, SVFR
  3. (aviation, humorous) Initialism of I follow roads, to navigate simply via prominent ground features; this may be at very low level when flight would only normally be possible under Instrument Flight Rules.
    • 1980, Rich Woods, “An encounter with God”, in Hoosier United Methodist‎[2], volume 10, number 4, page 2:
      Night flying is still a safe means of transportation, however, I have modified my VFR (Visual Flight Rules) night flights to a IFR (normally-Instrument Flight Rules) but in my case I Follow Roads[.]
  5. (epidemiology) Initialism of infection fatality rate.
    Coordinate terms: CFR, MR
    • For quotations using this term, see Citations:IFR.

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