一定

surely / certainly / necessarily / fixed / a certain (extent etc) / given / particular / must

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

to set / to fix / to determine / to decide / to order

not necessarily / maybe

must