() a set of Internet addresses that end with the same group of letters 域◆.com is the most popular domain on the Internet, with over 21 million names. .com 是互联网上最受欢迎的域，域名数量超过 2100 万个。◆You will need to register a domain name(= an individual Internet address). 你需要注册域名。
an area of knowledge or activity, especially one that sb is responsible for 领域◆a collection of documents relating to the domain of banking 有关银行业的文献资料◆Sometimes things outside your domain go wrong. 有时你本行之外的事情会出错。