noun
Imperial Palace; imperial residence
Specifically refers to the primary residence of the Emperor of Japan, located in Tokyo.
皇居の周りをジョギングする人が多い。
Many people jog around the Imperial Palace.
Standard kanji spelling; the reading こうぎょ is obsolete.
宮殿 is a general term for a palace, whereas 皇居 specifically denotes the Japanese Imperial Palace.
Compound of 皇 (こう, 'emperor') and 居 (きょ, 'residence').