The meaning of the Acronym IFR is...

IFR is

• Integral Fast Reactor

More Meanings For IFR:

• Interrupt Flag Register
• Internal Floating Roof
• Increasing Failure Rate
• Instrument Flight Rules
• Integral Fast Reactor
• Inspiratory Flow Rate
• Instrument Flight Rules
• Instrument Flight Rules
• Interim Final Rule
• Instrument Flight Rules
• I Follow Roads
• Instructional Flight Regulations
• International Finals Rodeo

IFR is also in:

• Architecture
• Assembly
• Electronics
• Meteorology
• Military
• NASA
• Physiology
• Sports
• Transportation
• Unfiled