Refers to a physical or conceptual space under someone's control or influence, such as a nation's territory or a company's market domain.
That country violated the neighboring country's territory.
This matter is outside my domain.
Broadly used for any specialized field, area of activity, or abstract realm, such as academic disciplines, professional expertise, or personal interests.
He is famous in the field of physics.
That is outside my area of expertise.
Mathematical term for the set of input values for which a function is defined, or a connected region in a space.
The domain of this function is all real numbers.
Illustrate the region on the complex plane.
Entering enemy territory is dangerous.
He expanded the scope of his research.
The neighboring country violated the territory.
That question strays into an area outside my expertise.
領域 is a broad, neutral term for a domain or territory, while 境地 emphasizes a realm attained through skill or personal development.
領域 is a general word for an area or domain (not necessarily political), while 領内 specifically means the interior of a ruler's territory.
領域 is a formal term for a region or domain, often used for abstract or physics 'fields', while フィールド is the loanword equivalent that can sound more casual or specialized.
control area; CA
active area