sit ‧ ting /ˈsɪtɪŋ/ BrE AmE noun [countable]
1 . one of the times when a meal is served in a place where there is not enough space for everyone to eat at the same time:
School dinners are served in three sittings.
2 . at/in one sitting during one continuous period when you are sitting in a chair:
I sat down and read the whole book in one sitting.
3 . an occasion when you have yourself painted or photographed
4 . a meeting of a law court or parliament