cŏoptātĭo, ōnis, 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.
cooptātiō ōnis, f coopto, an election to office, appointment, choice : collegiorum: censoria, by ...
An Elementary Latin Dictionary