study hall noun
plural ∼ halls US : a time during the school day when a student is expected to go to a particular room in the school to study or to complete work assigned in other classes [noncount] ▪ I have study hall next period. ▪ She got in trouble for talking in/during study hall. [count] ▪ a required study hall ▪ My study hall starts at 11:04.
