cogitandum
cogitandum is a Latin form of cogito, meaning “think, consider”. It is the gerund accusative singular.
Found 60 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.40.1: Haec cum animadvertisset, convocato consilio omniumque ordinum ad id consilium adhibitis centurionibus, vehementer eos incusavit: primum, quod aut quam in partem aut quo consilio ducerentur sibi quaerendum aut cogitandum putarent.
All forms of cogito (conjugation 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.