pacto
pacto is a Latin form of pactum, meaning “agreement, pact; way, manner (quo pacto: how)”.
It can also be a form of pacisco, “(paciscor) make a bargain, agree; (pactum) agreement”. It is the perfect passive participle ablative singular neuter.
Found 382 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 7.83.5: quid quoque pacto agi placeat occulte inter se constituunt; adeundi tempus definiunt, cum meridies esse videatur.
Plautus, Bacchides 5.2.1178b: At scin quo pácto me ad te intro ábducas?
Plautus, Poenulus 4.1.817: Exspécto quo pactó meae techinaé processuraé sient.
All forms of pactum (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.