verb, adjective, noun · to fix, set, or make definite

会议的时间已经定下来了。

verb · to subscribe to, book, or order goods and services

我定了一份明年的报纸。

verb · to congeal or coagulate

等锅里的肉冻放凉定住了，再取出来切片。

adverb · surely or definitely (literary usage)

此行定能成功。