noun
plural -mains
[count] the land that a ruler or a government controls :territory
an area of knowledge or activity
computers
a section of the Internet that is made up of computers or sites that are related in some way (such as by use or source)
An abbreviation of an Internet site's domain (such as .gov, .org, and .com) is included in its address: www.Merriam-Webster.com.
domain name