1. An area of activity over which somebody has control: Mrs. Smith, the customer, complained to Mrs. Wilson in the department store about a product she had recently bought, but since it wasn't in Mrs. Wilson's domain to solve the problem, Mrs. Smith was sent to the customer service desk.
2. Territory ruled by a government or a leader: In the story, the king ruled over his domain in a cruel way.
3. An area of land owned and controlled by a person, family, or organization: The estate, or domain, that Jane's family owned belonged to her ancestors many, many years ago.
4. In law, a right relating to the ownership of land: In a domain, whoever has the absolute right of possession also has the right to dispose of that piece of property.
5. In computerese and internet: A domain name is the sequence of words, phrases, abbreviations, or characters that identifies a specific computer or network on the internet and serves as its address.
7. Etymology: from Latin dominium, "right of ownership, dominion"; from dominus, "a lord"; "a territory under one government or ruler; supreme ownership".