also: ないてい
noun
inner courtyard; quadrangle
Refers to an open area enclosed by buildings or walls, such as in a traditional Japanese house, temple, or school.
この旅館には美しい内庭があります。
This inn has a beautiful inner courtyard.
校舎に囲まれた内庭で生徒たちが遊んでいる。
The students are playing in the quadrangle surrounded by school buildings.
中庭 is the more common word for a courtyard or inner garden; 内庭 is less frequent and may carry a slightly more formal or architectural nuance.
Compound of 内 (uchi, 'inside') and 庭 (niwa, 'garden'). The reading ないてい is the Sino-Japanese on'yomi reading of the same characters.