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| O/S | Operations and Support life cycle phase | |
| O/S | Operations and Support life cycle phase | |
| O/S | Operations and Support life cycle phase | |
| o/t | Other Times | |
| O/T | Oil Tanker | |
| O/THAN | Other Than | |
| O/V | OverVoltage | |
| O/V-U/V | Over-Voltage/Under-Voltage | |
| O/W | Oil-in-water | |
| o/w | otherwise | |
| O/W | Orwith | |
| O05 | Rogers Field Airport, Chester, Pennsylvania USA | |
| O1 | Officer grade: Ensign or 2nd Lieutenant | |
| Ö1 | Österreich 1 | |
| O10 | Officer grade: Admiral or General | |
| O11 | STILWELL CHEROKEE NATION Airport, Stilwell, Oklahoma | |
| O11 | Officer Grade: Fleet Admiral Or General of the Army | |
| O1C | A protein molecule. Formula: 2ALPHA-(3-HYDROXYPROPYL)-1ALPHA,25-DIHYDROXYVITAMIN D3 | |
| O1G | Orbán (prime minister of Hungary) Egy Geci | |
| O2 | Oxygen | |
| O2 | Object Oriented | |
| O2 | Officer grade: Lieutenant Junior Grade or 1st Lieutenant | |
| O2 | Oxygen | |
| O2 | Oxygen | |
| Ö2 | Österreich 2 |
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