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ORN
+/--- Order Request Number
/---- orange
/---- ornament
AcroLexic: Dictionary of Acronyms and Abbreviations contains 2 more definitions of “ORN”.
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See also

Acronym Definitions
CORN 12
PORN 2
NOFORN 2
AORN 2
ACORN 2
WESTFORNET 1
ORNL 1