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Meanings and definitions for OAO

Orbiting Astronomical Observatory, the name of four NASA scientific satellites
Open joint-stock company (Russian: Открытое Aкционерное Oбщество), business incorporation in Russia, Ukraine etc.
Odessey and Oracle, 1968 album by The Zombies
Oddworld: Abe's Oddysee a platform game made by Oddworld Inhabitants released in 1997
Open-access operator, a British passenger rail company which does not hold a franchise
Over And Out, Radiotelephony