Diet looks right, although I wasn't aware until now of this other meaning of diet:
diet2 (ˈdaɪət Pronunciation for diet2 )
Definitions
noun
(sometimes capital) a legislative assembly in various countries, such as Japan
Also called: Reichstag (sometimes capital) the assembly of the estates of the Holy Roman Empire
(Scots law)
the date fixed by a court for hearing a case
a single session of a court