Definitions of Ost:
  • name:  A surname (very rare: popularity rank in the U.S.: #24351)
  • noun:   Alternative form of oast
  • noun:   Initialism of original soundtrack.
  • noun:   (law, space science) Initialism of Outer Space Treaty: a treaty that represents the basic legal framework of international space law, signed in 1967.
  • noun:   Initialism of Open Skies Treaty.

(Definitions from Wiktionary)

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