sit‧ting /ˈsɪtɪŋ/ 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

[TahlilGaran] Dictionary of Contemporary English ▲