The meaning of the Acronym R is...

R is

• Rithmetic
• Respect
• Review
• Reinforcement
• Responsibility
• Retentive
• Radical

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