empress consort; emperor's wife
Refers to the consort of an emperor, especially the wife of the Japanese emperor. It does not usually mean a woman who rules as emperor in her own right.
式典には天皇皇后両陛下が出席された。
Their Majesties the Emperor and Empress attended the ceremony.
皇后陛下が被災地を訪問された。
Her Majesty the Empress visited the disaster-stricken area.
She became empress upon marriage.
The emperor installed her as empress.