和英辞書

常

noun

(obsolete) a traditional Japanese unit of measure for the length of cut cloth, equal to one 丈 (jō, roughly three meters) and three 尺 (shaku, roughly one foot or thirty centimeters)

彼は常に最善を尽くします。

He always does his best.

意味（1）

(obsolete) a traditional Japanese unit of measure for the length of cut cloth, equal to one 丈 (jō, roughly three meters) and three 尺 (shaku, roughly one foot or thirty centimeters)

意味（2）

(obsolete) a traditional Japanese unit of measure for the area of an agricultural field or paddy, equal to either 360 歩 (bu, around 1190 square meters), later reduced to 300 歩 (bu)/坪 (tsubo, almost 992 square meters)