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OST
+++++ office of science and technology
+/--- observation sequence table
/---- outer space treaty
AcroLexic: Dictionary of Acronyms and Abbreviations contains 9 more definitions of “OST”.
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See also

Acronym Definitions
POST 10
MOST 6
COST 3
PROST 3
DOST 3
OSTF 2
COSTAR 2
OSTP 2
EUROSTAT 2
OSTI 2
HOST 2
OSTS 2
POST-OP 2
COSTED 1
OSTC 1
VOST 1
POST. 1
ISOST 1
SCOSTEP 1
BIOSTU 1