平方平均数 píngfāngpíngjūnshù root mean square Origin Definitions Defs Strokes Stroke Words Sentences Sents 平方 píngfāng noun square The product of a number multiplied by itself; a square in mathematics; also called 二次幂 èrcìmì or 二次方 èrcìfāng平均数 平均數 píngjūnshù noun average average; mean; the quotient obtained by dividing the sum of several numbers by the count of those numbers