Seder is a Hebrew word meaning "order", and can have any of the following meanings:

• Seder - readings of the Torah according to the ancient Palestinian triennial cycle. The divisions are called sedarim.

• One of the six orders (major sections) of the Mishnah

• An order of prayers that constitutes a liturgy. See the article on siddur. (Example, The Seder of Rav Amram)

• A related order of prayers within a given liturgy, for example: the sounding of the shofar.

• The Passover Seder

• There is a holiday seder for the minor Jewish holiday of Tu B'shevat, the 15th day of the Hebrew month of Shevat. It is known as Hemdat ha-Yamim and is modeled on the Passover seder.