TishriPronunciation: /ˈtɪʃriː/ (also Tisri /ˈtɪzriː/)Definition of Tishri noun (in the Jewish calendar) the first month of the civil and seventh of the religious year, usually coinciding with parts of September and October. Origin:from Hebrew tišrīTishri in other Oxford dictionaries Definition of Tishri in the US English dictionary