Lewis Short
dēcessus (noun M) : decedo
* A going away, departure (opp. accessus—good prose).
* In gen.: post Dionysii decessum,Nep. Tim. 2, 3.
* Esp.
* The withdrawal, retirement of a magistrate from the province he has governed (in Cic. oftener decessio): post M. Bruti decessum,Cic. Phil. 2, 38; so Cael. ap. Cic. Fam. 8, 10 fin.
* Pregn., decrease, disappearance, departure: aestūs,the ebbing, subsidence,Caes. B. G. 3, 13; Nili,Plin. 18, 18, 47, § 168: febris,Cels. 3, 12: morbi,Gell. 4, 2, 13.
* Decease, death: amicorum decessu plerique angi solent,Cic. Lael. 3, 10; cf.: EX DECESSV L. CAESARIS, Cenot. Pis. ap. Orell. Inscr. 643.
Charlton T. Lewis, Charles Short, A Latin Dictionary