Lewis Short
prōrŏgātĭo (noun F) : prorogo.
* A prolonging, extension of a term of office: prorogatio imperii,a prolongation of one's command,Liv. 8, 26 fin.
* A putting off, deferring of an appointed time: diei,Cic. Att. 13, 43 (in Cic. Mur. 23, 47, the true reading is perrogationem; in Liv. 42, 30, 9, propagatio).
Charlton T. Lewis, Charles Short, A Latin Dictionary