OAO
1.
U.S. Aerospace. Orbiting Astronomical Observatory: one of a series of scientific satellites that studied astronomical phenomena at ultraviolet and x-ray wavelengths.
orbiting astronomical observatory
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1. Office of Alien Property Custodian.
- Oapec
/əʊˈeɪpɛk/ noun acronym 1. Organization of Arab Petroleum Exporting Countries Organization of Arab Petroleum Exporting Countries
- Oapo
Eastern Pacific Tuna Fishing Organization
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Office of Adolescent Pregnancy Programs