domain
/dəˈmeɪn/- 1.
A specific area of knowledge, activity, or expertise. It suggests a clearly defined space that belongs to a subject or a person. Commonly used in academic and professional writing.
- Artificial intelligence falls within the domain of computer science.
- She has years of experience in the domain of public health.
- This legal question is outside my domain.
- 2.
The unique name that identifies a website or online service on the internet. It is the address people type to visit a website.
- They registered a new domain for their startup last week.
- Our company domain is easy to remember and spell.
- 3.
In formal or historical use, an area of land or territory that is owned or controlled by a ruler, government, or powerful person.
- The entire valley was once part of the king's domain.
- The national park was declared a protected public domain.
Adinary Nuance
"Domain" is often used where simpler words like "field," "area," "sphere," or "realm" could also work — but the choice carries a real difference in tone. "Field" is the most neutral and everyday choice; you can say "field of medicine" in any context without sounding formal or stiff. "Domain" implies clearer ownership or mastery of a subject, making it the stronger, more precise pick in academic essays and IELTS writing. "Sphere" is equally formal but tends to describe social or political influence ("sphere of influence"), while "realm" is more literary and suits poetic or abstract descriptions. In professional and academic English, "domain of expertise" signals both boundaries and authority — which "area of expertise" does not quite match.
In other languages
- Vietnamese
- Lĩnh vực
- Spanish
- Dominio
- Chinese
- 领域
- Japanese
- 領域
- Korean
- 영역
Etymology
From Old French "domaine" and Latin "dominium," meaning ownership or property, derived from "dominus" (lord, master). The word entered English in the mid-17th century, first referring to land, then broadening to cover areas of knowledge and the internet era's web addresses.
Common phrases
Synonyms
Related words
Frequently asked questions
- Is 'domain' formal or informal?
- 'Domain' is a formal word. It is well suited to academic writing, IELTS essays, and professional contexts. In casual conversation, people more often say 'field' or 'area' instead.
- What is the difference between 'domain' and 'field'?
- 'Field' is neutral and works in any context — everyday speech, formal writing, and business. 'Domain' is more formal and suggests clear boundaries of ownership or expertise, so it sounds stronger and more precise in academic writing.
- Can I use 'domain' in IELTS writing?
- Yes, 'domain' is an excellent IELTS word. Phrases like 'in the domain of science' or 'within the public domain' show range and precision. Just avoid overusing it — vary with 'field' or 'sphere' too.
- What does 'public domain' mean?
- 'Public domain' refers to creative works — like old books or music — that are no longer protected by copyright and can be used freely by anyone. It is also used to describe land or information owned by the public or government.