rhetoricen
rhetoricen is a Latin form of rhetorice, meaning “the art of rhetoric”. It is the accusative singular feminine noun.
Found 30 times in the Latin texts on Socratos.
Where it is used
Quintilian, Institutio Oratoria 2.1.3: … opera, facta sint alterius novissima, et aetas altioribus iam disciplinis debita in schola minore subsidat ac rhetoricen apud grammaticos exerceat. ita , quod est maxime ridiculum, non ante ad declamandi magistrum mittendus videtu …
All forms of rhetorice (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.