defectione
defectione is a Latin form of defectio, meaning “desertion, revolt; failure, weakness; eclipse”. It is the ablative singular feminine noun.
Found 55 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 5.22.3: Cassivellaunus hoc proelio nuntiato tot detrimentis acceptis, vastatis finibus, maxime etiam permotus defectione civitatum legatos per Atrebatem Commium de deditione ad Caesarem mittit.
All forms of defectio (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.