litterarum
litterarum is a Latin form of littera, meaning “letter (of the alphabet); (pl.) letter, literature”. It is the genitive plural feminine noun.
Found 322 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 6.14.4: … t neque eos, qui discunt, litteris confisos minus memoriae studere: quod fere plerisque accidit, ut praesidio litterarum diligentiam in perdiscendo ac memoriam remittant.
Aulus Gellius, Noctes Atticae 17.9.5: Est adeo Probi grammatici commentarius satis curiose factus De Occulta Litterarum Significatione in Epistularum C. Caesaris Scriptura.
All forms of littera (declension table)
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.