jiào àn
lesson plan
teaching plan
a "missionary case" (a dispute over Christian missionaries during the late Qing)
jiào ān
teach in peace (polite phrase to end a letter to a teacher)
Jiāo tōng Dà xué
abbr. for 上海交通大學|上海交通大学 Shanghai Jiao Tong University, 西安交通大學|西安交通大学 Xia'an Jiaotong University, 國立交通大學|国立交通大学 National Chiao Tung University (Taiwan) etc