lūsĭo, ōnis, f. [ludo],
a playing, play : in ludum discendi, non lusionis, Cic. Q. Fr. 3, 4, 6: pueri lusionibus vel laboriosis delectantur, id. Fin. 5, 20, 55: in ipsā lusione (pilae), in the act of playing , id. de Or. 1, 16, 73: pilaris lusio, Stat. S. 4 praef.