Definition of 反 (たん)
たん
                        反
たん
tan
noun
1.
variable measure of fabric (28.8 cm in width), for kimonos: at least 10 m in length, for haori: at least 7.27 m in length, for other clothes: at least 6.06 m in length
2.
300 tsubo (991.74 meters square, 0.24506 acres)
3.
six ken (10.91 m)
Other readings:
                段【たん】
                Related Kanji
| 反 | anti- | 
| 段 | grade, steps, stairs |