[] () 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。public domain top-level domain