一流 yīliú HSK5 first-class Definitions Defs Origin Strokes Stroke Words Sentences Sents yīliú first-class 一 yī numeral one one; the number 1; single; alone流 liú adjective class a category, school of thought, grade, or rankyīliú the same kind · same school of thought 一 yī numeral same same; identical; unified流 liú adjective class a category, school of thought, grade, or rankyīliú unit of silver 一 yī numeral one one; the number 1; single; alone流 liú noun stream a stream of water or a continuous moving mass of something resembling a liquid, such as air or electricity