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OSR
++/-- Operational Safety Requirement
++/-- Office of Standards and Regulations
+/--- Office of Science and Research
AcroLexic: Dictionary of Acronyms and Abbreviations contains 11 more definitions of “OSR”.
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See also

Acronym Definitions
OSRS 3
OSRD 2
MOSR 2
OSRO 2
COSR 2
OSRI 1
AFOSR 1