Caodong school
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Caodong school (Chinese: 曹洞宗; pinyin: Cáodòng zōng; Wade–Giles: Ts'ao-tung-tsung) is a Chinese Chan Buddhist branch and one of the Five Houses of Chán.
The school emphasised sitting meditation (Ch: zuochan, Jp: zazen), and the "five ranks" teaching. During the Song dynasty, Caodong masters like Hongzhi Zhengjue developed "silent illumination" (mozhao) meditation.