TokyoPronunciation: /ˈtəʊkɪəʊ/Translate Tokyo | into German Definition of Tokyo the capital of Japan; population 12,758,000 (est. 2007). Formerly called Edo, it was the centre of the military government under the shoguns (1603–1867). It was renamed Tokyo in 1868, when it replaced Kyoto as the imperial capital. Tokyo in other Oxford dictionaries Definition of Tokyo in the US English dictionary