初三 chūsān third day of lunar month Definitions Defs Origin Strokes Stroke Words Sentences Sents chūsān third day of lunar month · third day of the New Year 初 chū lunar month prefix prefix used before the numbers one through ten to denote the first ten days of a lunar month三 sān numeral three the number three; 3chūsān ninth grade 初 chū abbreviation of 初级中学 初級中學 chūjízhōngxué junior high school A middle school providing the first three years of secondary education. Often shortened to 初中 chūzhōng. In Taiwan, these schools were formally renamed to 国民中学 guómínzhōngxué.三 sān numeral third the third in a series; ordinal number three