PIRI
| Acronym | Definition |
|---|---|
| PIRI | Photonic Integration Research Inc. (Columbus, OH) |
| PIRI | Public Information Resources, Inc. (Needham, MA) |
| PIRI | Photoinduced Rydberg Ionization (spectroscopic technique) |
| PIRI | Partners in RBCA (Risk-Based Corrective Action) Implementation (various countries; environmental program) |