Definition of RDA abbreviation from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌɑː diː ˈei//
; NAmE NAmE//ˌɑːr diː ˈei//
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recommended daily allowance or recommended dietary allowance (the amount of a chemical, for example a vitamin or a mineral, which you should have every day)
See the Oxford Advanced American Dictionary entry: RDA