二元 èryuán binary Origin Definitions Defs Strokes Stroke Words Sentences Sents èryuán binary · duality 二 èr numeral two the number two; 2元 yuán nounadjective unit (bound form) a constituent part; unitèryuán two-place 二 èr numeral two the number two; 2元 yuán variable (math.) an unknown; a variable