From Longman Dictionary of Contemporary Englishsittingsit‧ting /ˈsɪtɪŋ/ noun [countable] 1 DFone 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 sitting3 AVPTCPan occasion when you have yourself painted or photographed4 SCCPGPa meeting of a law court or parliament
Examples from the Corpus
sitting• I had five sittings, an hour at a time.• Dinner is served in three sittings. 