| yī | one/1/single/a (article)/as soon as/entire/whole/all/throughout |
| 一 | one 1 single |
| 一…一… | all |
| 一…不… | used with two verbs to indicate the unalterability of a situation |
| 一…再… | repeatedly |
| 一…半… | used with synonymous words, forming a phrase implying not much or many or not a long time |
| 一…就… | no sooner...than... |
| 一…而… | … in one … |
| 一一 | one by one one after another |
| 一一对应 | one-to-one correspondence |
| 一一映射 | bijective map (i.e. map between sets in math. that is one-to-one and onto) one-to-one correspondence |
| 一丁不识 | illiterate, ignorant |
| 一丁点 | a tiny bit a wee bit |
| 一丁点儿 | wee bit |
| 一丈 | a unit in Chinese lineal measurement slightly longer than ten feet |
| 一上一下 | one on the other |
| 一上来 | at first; at the beginning |
| 一下 | (used after a verb) give it a go to do (sth for a bit to give it a try) one time |
| 一下儿 | erhua variant of 一下 |
| 一下子 | in a short while all at once all of a sudden |
| 一不做，二不休 | don't do it, or don't rest (idiom); either give up, or go through to the end Since we started, we must carry it through whatever happens. in for a penny, in for a pound |