| Acronym | Definition |
|---|
| IRAA➣Indoor Radon Abatement Act |
| IRAA➣Intelsat Retirees and Alumni Association (est. 1999; Silver Spring, MD) |
| IRAA➣International Registry of Artists and Artwork |
| IRAA➣Investors' Rights Association of America |
| IRAA➣Industrial Relations Amendment Act (various nations) |
| IRAA➣Internal Reference Amino Acid (biochemistry) |
| IRAA➣Indirect Radiolabeled Antiglobulin Assay (human sperm studies) |