O
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| object identifier |  |
| object orientation [OO] |  |
| object-oriented database [OODB] |  |
| object-oriented database management system [OODBMS] |  |
| object-oriented language |  |
| object-oriented programming [OOP] |  |
| object-oriented system analysis & design [OOSA&D] |  |
| object-oriented technology [OOT] |  |
| off-line mode |  |
| office automation [OA] |  |
| office system |  |
| on-going support |  |
| on-line job |  |
| on-line mode |  |
| on-line service |  |
| on-line transaction processing [OLTP] |  |
| one-stop access portal [OSP] |  |
| open reel tape |  |
| open source software [OSS] |  |
| open system |  |
| operating environment |  |
| operating system |  |
| operating system software |  |
| optical character reader [OCR] |  |
| optical character recognition [OCR] |  |
| optical disk drive |  |
| optical fibre |  |
| optical mark reader [OMR] |  |
| optical mark recognition |  |
| optical storage device |  |
| outbox |  |
| output |  |
| outsourcing |  |
| overwrite |  |
|