legionis
legionis is a Latin form of legio, meaning “legion”. It is the genitive singular feminine noun.
Found 159 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.42.6: … ommittere audebat, commodissimum esse statuit omnibus equis Gallis equitibus detractis eo legionarios milites legionis X., cui quam maxime confidebat, imponere, ut praesidium quam amicissimum, si quid opus facto esset, haberet.
All forms of legio (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.