Lewis Short
sēcessĭo (noun F) : secedo, I. B..
* (Acc. to secedo, I. B. 1.) A going aside to consult, etc., a withdrawal: seductiones testium, secessio subscriptorum,Cic. Mur. 24, 49: milites vesperi secessionem faciunt,Caes. B. C. 1, 20, 1: primores, secessione factā, etc.,having withdrawn,Liv. 21, 14, 1.
* (Acc. to secedo, I. B. 2.) A political insurrectionary withdrawal or separation; a schism, secession (the prevailing signif. of the word; syn.: defectio, seditio): ultima rabies secessio ab suis habebatur,Liv. 7, 40, 2: secessionem tu illam existimasti, Caesar, initio, non bellum,Cic. Lig. 6, 19: tum demissi populo fasces, tum provocationes omnium rerum, tum secessio (pern. secessiones) plebis, etc.,Cic. Rep. 1, 40, 62 Mos. N. cr.; cf. Liv. 2, 32 sq.; 3, 39; Caes. B. C. 1, 7: per secessionem armati Aventinum occupavere,Sall. J. 31, 17: in secessione Crustumerinā,Varr. L. L. 5, § 81 Müll.; cf.: secessio ab decemviris facta est,Liv. 3, 51: in Aventinum montem secessionem factam esse,id. 2, 32.
Charlton T. Lewis, Charles Short, A Latin Dictionary