Soka GakkaiPronunciation: /ˌsəʊkə ˈgakʌɪ/Definition of Soka Gakkai a political and lay religious organization founded in Japan in 1930, based on the teachings of the Nichiren Buddhist sect. Origin:Japanese, from sō 'create' + ka 'value' + gakkai '(learned) society'Soka Gakkai in other Oxford dictionaries Definition of Soka Gakkai in the US English dictionary