| Abbreviation | Definition |
|---|---|
| RI | Retrograde Inversion |
| RI | Rhode Island |
| RI | RI is |
| RI | Right Indication |
| RI | Rigorous Imprisonment |
| RI | Rim Intensity |
| RI | Ringlet Identifier |
| RI | Rock Island |
| RI | Rotary International |
| RI | Rotation Invariant |
| RI | Royalty Interest |
| RI | Ruby Interactive |
| RI | Rule Induction |
| RI | Run In |
| RIA | Regulatory Impact Assessment |
| RIA | Restoration Industry Association |
| RIA | Restrictive Intervention Application |
| RIA | Rich Internet applications |
| RIA | Rock Island Armory |
| RIAA | Rice Is Always Available |