Meanings
- abbreviationinitialismnuclear physicsengineeringInitialism of Integral Fast Reactor.
- abbreviationinitialismpilot trainingaeronauticsInitialism of instrument flight rules, a set of rules for a pilot flying on instruments, primarily as a means of navigating through inclement weather.
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.
1953, F.N. Piasecki, L.S. Wigdortchik, “Can the Airlines Use the Helicopter?”, in SAE Transactions, volume 61, page 98 - abbreviationhumorousinitialismaeronauticsInitialism 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.
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[.]
1980, Rich Woods, “An encounter with God”, in Hoosier United Methodist, volume 10, number 4, page 2 - abbreviationinitialismepidemiologyInitialism of infection fatality rate.
For quotations using this term, see Citations:IFR.
Rhymes & wordplay
Anagrams
Cite this entry
IFR. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/IFR
“IFR.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/IFR. Accessed November 3, 2026.
WatkinsX Dictionary, s.v. “IFR,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/IFR.
Source: IFR on Wiktionary, CC BY-SA 4.0.