領域

ひらがな

りょういき

noun

realm, territory, occupied area / field (area of expertise) / (mathematics) domain

He made many contributions in the realm of physics.

意味（1）

(mathematics) domain

Kimi wa kiken na ryōiki ni fumikondeiru yo.You're stepping into dangerous territory.

意味（2）

realm, territory, occupied area

研究(けんきゅう)領域(りょういき)

kenkyū ryōikiarea of study

意味（3）

field (area of expertise)