| 一定 | yī dìng | surely; certainly; necessarily; fixed; a certain (extent etc); given; particular; must |
| 一些 | yī xiē | some; a few; a little |
| 第一 | dì yī | first; number one |
| 一切 | yī qiè | everything; every; all |
| 一次 | yī cì | first; first time; once; (math.) linear (of degree one) |
| 统一 | tǒng yī | to unify; to unite; to integrate |
| 一起 | yī qǐ | in the same place; together; with; altogether (in total) |
| 一下 | yī xià | (used after a verb) give it a go; to do (sth for a bit to give it a try); one time; once; in a while; all of a sudden; all at once |
| 同一 | tóng yī | identical; the same |
| 一直 | yī zhí | straight (in a straight line); continuously; always; from the beginning of... up to...; all along |
| 一面 | yī miàn | one side; one aspect; simultaneously... (and...); one's whole face |
| 一致 | yī zhì | unanimous; identical (views or opinions) |
| 一天 | yī tiān | one day |
| 一边 | yī biān | one side; either side; on the one hand; on the other hand; doing while |
| 不一 | bù yī | to vary; to differ |
