A / auctārĭum
noun

auctārĭum

gen. auctārii · gender neuter · decl. 2nd
an addition; augmentation
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.