一定 yīdìng HSK2 surely Definitions Defs Origin Strokes Stroke Words Sentences Sents Showing: fixed All meanings 646 yīdìng 646 surely 625a certain 20fixed 1 1 sentence for 一定 (yīdìng — fixed) 这里的规矩是一定的,不能随意更改。 zhèlǐ de guīju shì yīdìng de, bù néng suíyì gēnggǎi. The rules here are fixed and cannot be changed at will. Source: Dong Chinese Dictionary