| Ready To Apply | Academic & Science |
| Root The Area | Academic & Science |
| Radar Terrain Analysis | Academic & Science |
| Research and Technology Agency | Academic & Science |
| Rotuma Island | Airport Code |
| Radix Teachers Association | Business |
| Registrar And Transfer Agents | Business |
| Request for Technical Action | Business |
| Regional Tourism Administration | Business |
| Rear Trailing Arm | Business |
| Regional Trade Agreement | Business |
| Rio Tinto Alcan | Business |
| Riverside Transit Agency | Business |
| Red Tractor Assurance | Business |
| Rubidium Titanyl Arsenate | Chemistry |
| Real Time Author | Community |
| Residential Tenancies Authority | Community |
| Retread Tire Association | Community |
| Retail Travel Agency | Community |
| Respect The Artists | Community |
| Restricted To Adults | Community |
| Railway Tie Association | Community |
| Rochester Teachers Association | Community |
| Reversing Tool for Assembler | Computer Assembly Language |
| Resource Technology Associates | Computing |
| Returning To Application | Computing |
| Real Time Agent | Computing |
| Response Time Accelerator | Computing |
| Real Time Access | Computing |
| Real Time Architect | Computing |
| Repeat To Address | Computing |
| Reply To All | Computing |
| Run Time Access | Computing |
| Run Time Analysis | Computing |
| Run Time Application | Computing |
| Real Time Data Acquisition | Computing |
| Response Time Analyzer | Computing |
| Real Time Accelerator | Computing |
| Remote Trunk Arrangement | Computing |
| Real Time Audio | Computing |
| Riberalta, Bolivia, Seismograph Station | Earth Science |
| Rapid Thermal Anneal | Electronics |
| Real-time Analyzer | Electronics |
| Religious and Theological Abstracts | General |
| Railroad Tie Association | General |
| Required Time of Arrival | General |
| Rebuildable Tank Atomizers | General |
| Remote Transaction Assist | General |
| Renal Tubular Acidosis | General |
| Random Time Analysis | General |
| Ridgewood Tri Athlete | General |
| Revue Technique Automobile | General |
| Read To Achieve | General |
| Red Team Automation | General |
| Revista Tecnica Automovel | General |
| Right Turn Ahead | General |
| Ready To Awe | General |
| Rewriting Techniques and Applications | General |
| Real Time Automation | General |
| Read The Article | General |
| Road Transport Authority | General |
| Rear Traffic Alert | General |
| Reverse Traffic Alert | General |
| Road Tire All | General |
| Redline Time Attack | General |
| Road Transport Act | General |
| Rear Toe Arms | General |
| Regional Transport Authority | General |
| Renault Tourisme Automatique | General |
| Renault Tecnologia Americas | General |
| Reliability Test Assembly | General |
| Rwanda Transport Association | General |
| Right Turn Arrow | General |
| Research Training Award | General |
| Remediation Target Areas | General |
| Real Time Attack | General |
| Road To Awe | General |
| Remember this always | General |
| Real Time Augmentation | General |
| Rebuildable Tank Atomizer | General |
| Random Tactical Arena | General |
| Rapid Transit Administration | Governmental |
| Regional Transit Administration | Governmental |
| Road To Avonlea | Governmental |
| Roads and Traffic Authority | Governmental |
| Road Traffic Accident | Governmental |
| Regional Transportation Authority | Governmental |
| Returned To Australia | Governmental |
| Roads and Transportation Authority | Governmental |
| Roads and Transport Authority | Governmental |
| Residential Tenancies Act | Governmental |
| Raleigh Transit Authority | Governmental |
| Refusal To Accept | Governmental |
| Roads & Traffic Authority | Governmental |
| Royal Thai Army | Governmental |
| Rapid Transit Authority | Governmental |
| Road Traffic Act | Governmental |
| RUTHIYAI | Indian Railway Station |
| Residenza Turistica Alberghiera | International |
| Referring Travel Agent | Jobs |
| Resident Technical Assistant | Jobs |
| Resident Twinning Advisor | Jobs |
| Real-time Analysis | Maths |
| Regional Transit Authority | Medical |
| Restorative Therapy Associates | Medical |
| Renal Tubule Acidosis | Medical |
| Replication and Transcription Activator | Medical |
| Retinal Thickness Analysis | Medical |
| Reverse Transcriptase Assay | Medical |
| Rehabilitation Through The Arts | Medical |
| Road Traffic Accidents | Medical |
| Ready To Assemble | Military and Defence |
| Repatriated To Australia | Military and Defence |
| Residual Threat Assessment | Military and Defence |
| Round Trip Average | Networking |
| Radio Television Afghanistan | News & Entertainment |
| Reactivity Test Assembly | Physics Related |
| Radially Tapered Antenna | Radio Science |
| Regional Transportation Agency | Regional |
| Regional Transportation Alliance | Regional |
| Regional Trade Agreements | Regional |
| Rotuma Island, Fiji | Regional |
| return to Africa | Regional |
| Regional Transportation | Regional |
| Regional Transport Aircraft | Regional |
| Real-time Accumulator | Space Science |
| Right Tossers Association | Sports |
| Recreational Tennis Association | Sports |
| Race Team Alliance | Sports & Games |
| Ruthiyai Junction | Transport & Travel |
| Roads & Transport Authority | Transportation |
