tantundem
tantundem is a Latin form of tantusdem, meaning “just so great; large”. It is the adverb.
Found 69 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 7.72.1: Quibus rebus cognitis ex perfugis et captivis, Caesar haec genera munitionis instituit. Fossam pedum viginti directis lateribus duxit, ut eius fossae solum tantundem pateret quantum summae fossae labra distarent.
Terence, Heautontimorumenos 4.2.676: Quid si hoc nunc sic incipiam? Nihil est. Quid si sic? Tantundem egero.
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.