一定
Written yī dìng, said yí dìng — 一 is yí before a fourth tone and yì before the others.
Meaning
- surely; certainly; definitely
- fixed; settled
- a certain ...; a given ...
Example sentence
这一定是我。
It has to be me.
Characters in 一定
一 one plus 定 to settle. Fixed as one thing, hence certainly — as a negative, 不一定 means not necessarily.