| IR | an advocate of irredentism |
|---|---|
| IR | incapable of being made smaller or simpler |
| IR | impossible to deny or disprove |
| IR | (informal) regardless |
| IR | merchandise that has imperfections |
| IR | a member of an irregular armed force that fights a stronger force by sabotage and harassment |
| IR | not occurring at expected times |
| IR | independent in behavior or thought |
| IR | used of independent armed resistance forces |
| IR | of a surface |
| IR | lacking continuity or regularity |
| IR | deviating from what is usual or common or to be expected |