(Judaism) The ceremonial meal held on the first night or two nights of Passover. / (Judaism) One of the 54 parts into which the Torah is divided.

plural of seder

plural of Seder

A surname.

(Scotland) A formal meeting, especially of a judicial or ecclesiastical body. / (Scotland) Those people present at such a meeting.

plural of sederunt

(mineralogy) A hexagonal-dihexagonal dipyramidal mineral containing nickel and selenium.