| RA | the ball used in playing the game of racquetball |
|---|---|
| RA | suggestive of sexual impropriety |
| RA | full of zest or vigor |
| RA | the unit of plane angle adopted under the System International d'Unites |
| RA | a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material |
| RA | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
| RA | a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position |
| RA | a housing for a radar antenna |
| RA | an electronic signal that has been reflected back to the radar antenna |
| RA | gunfire aimed a target that is being tracked by radar |
| RA | a radar echo displayed so as to show the position of a reflecting surface |
| RA | English writer whose novel about a lesbian relationship was banned in Britain for many years (1883-1943) |