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Subsonic may refer to:
Any speed lower than the speed of sound within a sound propagating medium is called subsonic
Subsonic aircraft, a flying machine that flies at air speeds lower than the speed of sound
subsonic flight, an aircraft flight at air speeds lower than the speed of sound in air
Subsonic and transonic wind tunnel
SubSonic (software), an open source object-relational mapper for .NET
Subsonic (media server), an open source media server
Subsonic (EP), an EP by Younha
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