壱

(1)the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one"

(2)この数を表わす最も小さな整数あるいは数字

(3)a single person or thing; "he is the best one"; "this is the one I ordered"

(4)単一の人あるいは物

(1)