The meaning of the Acronym R is...

R is

• Ramming
• Rule
• Readiness
• Required
• Resources
• Retreat
• Range
• Routine
• Regular
• Revision
• Radial
• Radical
• Rail
• Radfahrabteilung (German Bicycle Battalion, World War II)
• Rank
• Reinforcement
• Reconnaissance aircraft
• Russian
• Ritter (German: Knight)
• Removed
• Regiment
• Regular Army
• Rejoining
• Reviewing
• Revolution
• Rejected
• Rifle
• Reserve
• Respectfully

More Meanings For R:

• Received solid signal
• Responder
• Riser
• Ring
• Ray
• Rumex
• Retardation
• Receptive
• Room
• Repeat
• Research
• Angle of Reflection
• Result
• Roentgen
• Resilience

R is also in:

• Amateur Radio
• Architecture
• Astronomy
• Botany
• Physics
• Psychology
• Universities