Lewis Short
bacchātĭo (noun F) : id..
* A celebrating of the orgies of Bacchus, Hyg. Fab. 4; 8.—Hence.
* A revelling, raving, in the manner of the Bacchoe (rare): sileatur de nocturnis ejus baccationibus ac vigiliis, * Cic. Verr. 2, 1, 12, § 33.
Charlton T. Lewis, Charles Short, A Latin Dictionary