secum
secum is a Latin form of sui, meaning “himself, herself, itself, themselves”. It is the ablative singular masculine pronoun or ablative plural masculine pronoun.
Found 880 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.5.3: frumentum omne, praeter quod secum portaturi erant, comburunt, ut domum reditionis spe sublata paratiores ad omnia pericula subeunda essent; tri …
Ovid, Ars Amatoria 2.163: Secum habet ingenium, qui, cum libet, 'accipe' dicit;
Plautus, Rudens 1.2.129: duas sécum adduxit, quique adornaret sibi
All forms of sui (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.