auctarium
From LSJ
Latin > English (Lewis & Short)
auctārĭum: ii, n. augeo,
I an addition or augmentation of a definite measure: auctarium dicebant antiqui, quod super mensuram vel pondus justum adiciebatur, Paul. ex Fest. p. 14 Müll.: Eu. Tanti quanti poscit, vin tanti illum emi? Ch. Immo auctarium Adicito, Plaut. Merc. 2, 4, 23.
Latin > French (Gaffiot 2016)
auctārĭum, ĭī, n. (augeo), surplus, ce qui fait la bonne mesure : Pl. Merc. 490 ; P. Fest. 14.
Latin > German (Georges)
auctārium, ī, n. (augeo), die Zugabe, Zulage (zu einer Summe), immo auctarium adicito, vel mille nummûm plus quam poscet, Plaut. merc. 490 (cod. A auctorarium); vgl. Paul. ex Fest. 14, 17.
Latin > English
auctarium auctari(i) N N :: something in addition to the proper measure, lagniappe; addition, augmentation