一

一人 - hitori - one person, alone,

一体 - ittai - What on earth...?, Why in the world...?, As one, United, Generally speaking, In the first place,

一国 - ikkoku - one country, one nation, a single country,

一年 - ichinen - one year,

一年中 - Ichinenjū - All year round,

一日 - Tsuitachi - one day, first day of month,

一本 - Ippon - One (when counting long, cylindrical objects. E.g.: pens, bottles, trees),

一番 - ichiban - number one, best,

十一 - Jū ichi - eleven,