tantum
adverb
tan-tum · /ˈtan.tum/
only, merely, so much
A frozen neuter accusative of tantus used adverbially; the sense “only” comes from “just so much and no more”.
Panem cæléstem tantum, tantum, tantum
Ecce Agnus Dei tantum, tantum, tantum
external dictionary: Logeion