Lewis Short
cŏoptātĭo (noun F) : co-opto
* An election, choice: collegiorum,Cic. Lael. 25, 96: censoria,id. Leg. 3, 12, 27: in Patres,i. e. a confirmation by the Senate of Senators nominated by the king,Liv. 4, 4, 7 Weissenb. ad loc.; Flor. 4, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary