Lewis Short
congerro | concerro (noun M) : (, Fest. p. 356 Lindem.), , congero; prop. one who contributes to a common feast; cf. Lorenz ad Plaut. Most. v. 919
* A jolly companion, a playfellow (ante-class.), Plaut. Pers. 1, 3, 9; id. Most. 3, 3, 27 (931 Ritschl.); 5, 1, 8; cf. Varr. L. L. 7, p. 55 Müll.
Charlton T. Lewis, Charles Short, A Latin Dictionary