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RIA
+++++ radioimmunoassay
++/-- Regulatory impact analysis
++--- Regulatory Impact Assessment
AcroLexic: Dictionary of Acronyms and Abbreviations contains 19 more definitions of “RIA”.
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See also

Acronym Definitions
GLORIA 4
INRIA 3
ARIA 2
FTRIA 2
RIAS 2
RIACS 1
LRIA 1
MARIA 1
EQUATORIAL 1