The Mishnah or Mishna (/ˈmɪʃnə/; Hebrew: מִשְׁנָה, "study by repetition", from the verb shanah שנה, or "to study and review", also "secondary") It is the first major written collection of the Jewish oral traditions known as the "Oral Torah". It is also the first major work of Rabbinic literature. The Mishnah was redacted by Judah the Prince at the beginning of the third century CE[ in a time when, according to the Talmud, the persecution of the Jews and the passage of time raised the possibility that the details of the oral traditions of the Pharisees from the Second Temple period (536 BCE – 70 CE) would be forgotten.
Most of the Mishnah is written in Mishnaic Hebrew, while some parts are Aramaic. The Mishnah consists of six orders (sedarim, singular seder סדר), each containing 7–12 tractates (masechtot, singular masechet מסכת; lit. "web"), 63 in total, and further subdivided into chapters and paragraphs.
The word Mishnah can also indicate a single paragraph of the work, i.e. the smallest unit of structure in the Mishnah. For this reason the whole work is sometimes called in the plural, Mishnayot.