interior

C1 · Advanced Countable noun Formal

n. the part of a country that is far away from the coast or the borders.

n. the central or inland regions of a country or continent, situated away from the maritime borders or frontiers.

日本語:奥地※

“It took the explorers months to travel from the coast into the country's interior.”

“Economic development in the nation's interior has lagged behind the coastal cities due to the lack of reliable transport infrastructure.”

C2 · Proficiency Countable noun Mathematics Technical

n. the set of all points inside a specific boundary.

n. the set of all interior points of a given set; points that do not belong to the set's boundary.

日本語:内部※

“In geometry class, we learned how to identify the interior of a circle.”

“The theorem requires the function to be continuous on the closure of the set and differentiable on its interior.”

B2 · Upper Intermediate

adj. located on the inside of something.

adj. situated within or relating to the inside of something; internal.

“The car has interior lights that turn on when you open the door.”

“The interior walls of the spacecraft were lined with specialized insulation to protect the crew from extreme temperature fluctuations.”

C1 · Advanced Formal

adj. describing a place that is far from the sea.

adj. remote from the coast or frontier; situated in the inland part of a territory.

“The interior parts of the continent are much hotter than the coastal areas.”

“The interior tribes remained isolated from European trade for decades longer than those living along the Atlantic seaboard.”