The meaning of the Acronym AR is...

AR is

• Army Regulation
• Armor
• Atlantic Resolve (exercise name)
• Army Reserve
• Air Reconnaissance
• Automatic Rifle
• Assault Rifle
• Action Required

More Meanings For AR:

• Address Register
• Add Rows
• Attention Routine
• Artificial Reality
• archiver
• Argon
• Analytical Reagent
• Aspect Ratio
• Audio Rate
• Active Rainfall
• Absorptive Region
• As Removed
• Added Rice
• Repair ship (Auxiliary, Repair)
• Attack And Release

AR is also in:

• Aircraft
• Assembly
• Chemistry
• Electronics
• Food
• General
• Meteorology
• Physics
• Ship Types
• Unfiled
• Unix Commands