1 a period of time during which a court of law or a parliament meets and does its work （法庭的）开庭期；（议会的）开会期

2 a time when a meal is served in a school, hotel, etc to a number of people at the same time （学校、酒店等）一轮的用餐时间: Dinner will be in two sittings. 晚餐分两轮进行。