be ill at ease; feel restless; 心神不定
General stability has been achieved in the country. 天下大定。
accepted opinion; 定评
fixed number; 定数
decide on a policy; 定方针
make a plan; 定计划
fix one's eyes upon; 定睛
fix one's residence in Dalian 定居在大连
calm one's mind; 定心
bring peace and stability to the country; 安邦定国
certainly will succeed; 定可成功
be sure to win 定可取胜
Ding Lun 定伦
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)