[f. as prec., after gymnasium.] A place for the practice of callisthenics.
1850. Natchez Courier, 22 Oct., 3/1. The lessons of his Dancing Academy and Ladies Callisthenium will be necessarily omitted for one week.
1883. N. Y. Tribune, 25 Dec., 2/5. The calisthenium was thrown open and the girls danced until supper-time.