The meaning of the Acronym SIR is...

SIR is

• Sexy Intelligent Racer
• Sorry I'm Retarded

More Meanings For SIR:

• Serial Infrared
• Solitaire file Bitmap graphics
• System Internal Resource
• Sustained Information Rate
• Surface Insulation Resistance
• Shuttle Imaging Radar
• Science Information Robot
• Sexy Intelligent Racer
• Sorry I'm Retarded
• System Intermediate Representation
• Silent Information Regulator
• Soil Insect Rating
• Standard Information Retrieval
• String Instrument Repair
• Sort Interval Recursive

SIR is also in:

• Adults
• Drivers
• Electronics
• File Extensions
• General
• Ocean Science
• Unfiled
• Universities