Mishnah

n. part of the Talmud consisting of a collection of oral religious laws of Judaism (Hebrew)

The Mishnah (Hebrew משנה, "repetition"), redacted circa 200 CE by Yehudah Ha-Nasi (יהודה הנשׂיא / "President Judah"), is the first written recording of the Oral Torah of the Jewish people, as championed by the Pharisees, and as debated between 70-200 CE by the group of rabbinic sages known as the Tannaim. It is considered the first important work of Rabbinic Judaism and is a major source of Rabbinic Judaism's religious texts: Rabbinic commentaries on the Mishnah over the three centuries after its composition were then redacted as the Gemara (Aramaic: "Tradition").
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Noun
1. the first part of the Talmud; a collection of early oral interpretations of the scriptures that was compiled about AD 200
(synonym) Mishna
(hypernym) sacred text, sacred writing, religious writing, religious text
(part-holonym) Talmud

Mishnah or Mishneh (Hebrew) [from shanah to do something a second time, repeat] That which has been done a second time, a repetition; hence that which is handed on by repetition, oral tradition.
Specifically, a part of the Talmud, consisting of an arrangement of the extant Oral Law, divided into six Orders (sedarim) dealing with seeds, festivals, women, damages, holy things, and purifications.