kokutai UK /ˌkəʊkuːˈtaɪ/US /ˌkoʊkuˈtaɪ/ noun2 •(historical) The national essence and character of Japan viewed as conforming to Shinto-Confucian ideals, with the emperor as its ethical, spiritual, cultural and political center.In response to the international communist movement, the Peace Preservation Law was enacted to criminalize attempts to change the Japanese kokutai. •(historical) The ideology centered on the principle of kokutai.