MishnahPronunciation: /ˈmɪʃnə/Definition of Mishnah noun (the Mishnah) an authoritative collection of exegetical material embodying the oral tradition of Jewish law and forming the first part of the Talmud. Derivatives MishnaicPronunciation: /-ˈneɪɪk/ adjective Origin:from Hebrew mišnāh '(teaching by) repetition'Mishnah in other Oxford dictionaries Definition of Mishnah in the US English dictionary