rec·om·mend·ed dai·ly al·low·ance .rek-ə-.mend-əd-.dā-lē-ə-'lau̇-ən(t)s n, often cap R&D&A the amount of a nutriment (as a vitamin or mineral) that is recommended for daily consumption by the National Research Council of the U.S. National Science Foundation abbr. RDA
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popularly used synonym for recommended dietary a.Medical dictionary. 2011.