verb, noun, adverb, modal particle · to make a firm choice or resolve to take a specific course of action

我们决定明天出发去上海。

noun, verb, punctuation · a conclusion or resolution reached after consideration

你的决定非常英明。

verb · to be the primary factor that controls or dictates the nature or outcome of something.

气候决定了当地的植被类型。

adverb · definitely; used to emphasize the certainty of an outcome

只要你肯努力，决定能成功。