Usage: usually capitalized R
Etymology: so called from the facetiously used phrase reading, 'riting, and 'rithmetic
2. : the fundamental skills in a field of endeavor
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1. reading, 'riting, and 'rithmetic, regarded as the fundamentals of education.
2. the fundamentals, basic knowledge, or skills of any system or field: the three R's of good government.
[1820-30]
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three R's,
reading, writing, and arithmetic.
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noun
the three R's
Useful english dictionary. 2012.