一
| Level 4 vocabulary | ||
| 一 | (num) one/ (P) | |
| 〜一 | (num) one/ (P) | |
| 一緒 | (adv,n) together/ meeting/ company/ (P) | |
| 一日 | (n) (1) first of month/ (P) | |
| 一つ | (n) one/ (P) | |
| Level 3 vocabulary | ||
| 一度 | (n-adv) once/ one time/ on one occasion/ (P) | |
| 一生懸命 | (adj-na,n-adv,n) very hard/ with utmost effort/ with all one's might/ (P) | |
| Level 2 vocabulary | ||
| 一応 | (adv) once/ tentatively/ in outline/ for the time being/ (P) | |
| 一時 | (n-adv,n) one hour/ short time/ once/ a time/ temporarily/ at one time/ twelfth part of a day/ (P) | |
| 一段と | (adv) greater/ more/ further/ still more/ (P) | |
| 一度に | (adv) all at once/ (P) | |
| 一番 | (n-adv) (1) best/ first/ number one/ (2) a game/ a round/ a bout/ a fall/ an event (in a meet)/ (P) | |
| 一部 | (n-adv,n) (1) a part/ a portiona section/ some/ (2) one copy, e.g. of a document/ (P) | |
| 一流 | (n) first class/ top grade/ school (of art)/ foremost/ top-notch/ unique/ (P) | |
| 一家 | (n) a house/ a home/ a family/ a household/ one's family/ one's folks/ a style/ (P) | |
| 一昨日 | (n-adv,n-t) day before yesterday/ (P) | |
| 一昨年 | (n-adv,n-t) year before last/ (P) | |
| 一種 | (adv,n) a species/ a kind/ a variety/ (P) | |
| 一瞬 | (n-adv,n-t) a moment/ an instant/ (P) | |
| 一生 | (n-adv,n-t) whole life/ a lifetime/ all through life/ one existence/ a generation/ an age/ the whole world | |
| 一層 | (n-adv,n) much more/ still more/ all the more/ (P) | |
| 一体 | (adv,n) (1) one object/ one body/ (2) what on earth?/ really?/ (3) generally/ (P) | |
| 一旦 | (adv) once/ for a moment/ one morning/ temporarily/ (P) | |
| 一致 | (n,vs) (1) coincidence/ agreement/ union/ match/ (2) conformity/ consistency/ (3) co-operation/ (P) | |
| 一定 | (adj-no,n,vs) fixed/ settled/ definite/ uniform/ regularized/ defined/ standardized/ certain/ prescribed/ (P) | |
| 一般 | (adj-no,n) general/ liberal/ universal/ ordinary/ average/ (P) | |
| 一方 | (conj,n-adv,n) (1) on the other hand/ one side/ one way/ one direction/ one party/ the other party/ (2) me | |
| 統一 | (n,vs) unity/ consolidation/ uniformity/ unification/ compatible/ (P) | |
| 同一 | (adj-na,adj-no,n) identity/ sameness/ similarity/ equality/ fairness/ (P) | |
| 一言 | (n) single word/ (P) | |
| 一筋 | (adj-na,n) a line/ earnestly/ blindly/ straightforwardly | |
| 一通り | (adj-no,n) ordinary/ usual/ in general/ briefly/ (P) | |
| 一休み | (n) a rest/ (P) | |
| 一人一人 | (n-t) one by one/ each/ one at a time/ (P) | |
| 唯一 | (adv,n) only/ sole/ unique/ (P) | |
| Level 1 vocabulary | ||
| 一概に | (adv) unconditionally/ as a rule/ (P) | |
| 一同 | (n) all present/ all concerned/ all of us/ (P) | |
| 一部分 | (n) a part/ a portion/ a section/ (P) | |
| 一別 | (n) parting | |
| 一面 | (adv,n) one side/ one phase/ front page/ the other hand/ the whole surface/ (P) | |
| 一目 | (n-adv,n-t) a glance/ a look/ a glimpse/ (P) | |
| 一様 | (adj-na,n) uniformity/ evenness/ similarity/ equality/ impartiality/ (P) | |
| 一律 | (adj-na,n-adv,n) evenness/ uniformity/ monotony/ equality | |
| 一連 | (n) a series/ a chain/ a ream (of paper) | |
| 一括 | (n,vs) all together/ batch/ one lump/ one bundle/ summing up/ (P) | |
| 一気 | (n) (abbr) drink!(said repeatedly as a party cheer) | |
| 一挙に | (adv) at a stroke/ with a single swoop/ (P) | |
| 一見 | (adv,n,vs) (1) a look/ a glimpse/ glance/ (adv) apparently/ seemingly/ (2) first meeting/ (P) | |
| 一切 | (n-adv,n) all/ everything/ without exception/ the whole/ entirely/ absolutely/ (P) | |
| 一心 | (adv,n) one mind/ wholeheartedness/ the whole heart/ (P) | |
| 一帯 | (n) a region/ a zone/ the whole place/ (P) | |
| 一変 | (n,vs) complete change/ about-face | |
| 単一 | (adj-na,n) single/ simple/ sole/ individual/ unitory/ (P) | |
| 一息 | (n) puffy/ a breath/ a pause/ an effort | |
| 一頃 | (n-adv,n-t) once/ some time ago | |