Lewis & Short

dōnātīvum, i, n. [dono], a largess, donative given by the emperor to each soldier of the army, at his accession or majority, or other extraordinary occasion (v. congiarium, II.), Suet. Calig. 46; id. Galb. 16; Tac. H. 1, 18; 37 fin. al.; opp. congiarium, Plin. Pan. 25, 2; Tac. A. 12, 41; Suet. Ner. 7 al.
Adj., Inscr. Grut. 421, 1.