cepissent
cepissent is a Latin form of capio, meaning “take, seize; capture”. It is the 3rd person plural pluperfect active subjunctive.
Found 34 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 5.26.3: Cum celeriter nostri arma cepissent vallumque adscendissent atque una ex parte Hispanis equitibus emissis equestri proelio superiores fuissent, desperata re hostes suos ab oppugnatione reduxerunt.
All forms of capio (conjugation 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.