領域(りょういき)

りょういき
noun
domain; field; territory; area
1. domain; field; area of expertise
A specific area or sphere of activity, knowledge, or responsibility.
新(あたら)しい領域(りょういき)に挑戦(ちょうせん)する。
To take on a new field.
それは私(わたし)の専門(せんもん)領域(りょういき)ではない。
That is not my area of expertise.
AI研究(けんきゅう)の領域(りょういき)は年(ねん)々広(ひろ)がっている。
The field of AI research is expanding year by year.
2. territory; region
A physical area or space.
領域(りょういき)を侵(おか)す。
To invade territory.
この島(しま)は我(わ)が国(くに)の領域(りょういき)だ。
This island is our country's territory.
他国(たこく)の領域(りょういき)に許可(きょか)なく入(はい)ることはできない。
You cannot enter another country's territory without permission.

領域(りょういき) covers both abstract domains (fields of knowledge, expertise) and physical territories.

COMMON EXPRESSIONS:

  • 専門(せんもん)領域(りょういき): area of expertise
  • 研究(けんきゅう)領域(りょういき): field of research
  • 領域(りょういき)を広(ひろ)げる: to expand one's domain
  • 領域(りょういき)を侵(おか)す: to invade territory; to encroach on someone's domain
  • 未知(みち)の領域(りょういき): uncharted territory

SIMILAR WORDS:

  • 分野(ぶんや): field (of study/work) — more everyday, commonly used for academic or professional fields
  • 範囲(はんい): scope, range — emphasizes boundaries
  • 領土(りょうど): territory — specifically national/political territory

領域(りょういき) is more formal and broader than 分野(ぶんや), and is often used in academic, scientific, and political contexts.

Related Words

Synonym: 分野(ぶんや) (field (everyday))
Related: 範囲(はんい) (scope, range)
Related: 領土(りょうど) (national territory)
general
Added 2026.1.16 16:39 · Revised 2026.4.14 15:33
05000/05459_ryouiki