プログレッシブ和英中辞典(第4版)の解説
ひとけた【一桁】
一けたの数字
a digit
私の収入は彼のより一けた少ない
My income is one digit smaller than his.
同じ音楽家でも彼女と彼は一けたも二けたも違う
Though both she and he are musicians, there is a big difference between them.
昭和一けた生まれの人
a person who was born in the first nine years of Showa