quarto
quarto is a Latin form of quartus, meaning “fourth”. It is the ablative singular masculine adjective.
Found 125 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.26.5: … rfuerunt eaque tota nocte continenter ierunt [nullam partem noctis itinere intermisso]; in fines Lingonum die quarto pervenerunt, cum et propter vulnera militum et propter sepulturam occisorum nostri [triduum morati] eos sequi …
Vergil, Aeneid 3.205: Quarto terra die primum se attollere tandem
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.