/dəˈmeɪn; US dəʊ- ||; doˈmen/noun[C] 1 an area of knowledge or activity （知识、活动的）领域: I don't know -- that's outside my domain. 我不懂─我是门外汉。This issue is now in the public domain (= the public knows about it). 这个问题现在人人都知道了。
2 (computing计算机技术) a set of Internet addresses that end with the same group of letters 域名（因特网上以同一组字母结尾的地址）