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| OP CIT | Opere Citato | |
| OP GEB | OperationsGebiet (Area of combat operations) | |
| op-amp | op-amp:operational amplifier | |
| OP-ED | OPposite the EDitorial page | |
| OP-ED | OPinion EDitorial | |
| OP-TDLAS | Open Path Tunable Diode Laser Absorption Spectroscopy | |
| Op. | Opus number | |
| OP/CO | Operating Company | |
| OP2P | Opportunistic Peer to Peer | |
| OP2S | Opposed Piston Two Stroke | |
| OPA | Other Procurement, Army | |
| OPA | Other Procurement, Army | |
| OPA | Other Procurement Authority | |
| OPA | Kopasker, Iceland | |
| OPA | OroPharyngeal Airway | |
| OPA | Psion OPL Object file | |
| OPA | Oil Pollution Act of 1990 | |
| OPA | Oral Proficiency Assessment | |
| OPA | Official Police Action | |
| OPA | Outcome, Purpose, Action | |
| OPA | Oil Producers Association | |
| OPA | Overseas Performing Artist | |
| OPA | Online Personal Access | |
| OPA | Office of Population Affairs (Department of Health and Human Services) | |
| OPA | Ohio Psychological Association |
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